Relevant bibliographies by topics / Spin dependent transport models

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Spin dependent transport models'

Author: Grafiati
Published: 4 June 2021
Last updated: 16 February 2022

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Journal articles on the topic "Spin dependent transport models"

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Andrianov, Timofey, and Anatoly Vedyayev. "Numerical simulation of spin transport in systems with complex geometry." EPJ Web of Conferences 185 (2018): 01021. http://dx.doi.org/10.1051/epjconf/201818501021.

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The spin diffusion and charge equations in Levy-Fert and Waintal models were numerically solved, using finite element method in complex non-collinear geometry with strongly inhomogeneous current flow. As an illustration, spin-dependent transport through a magnetic pillar and nonmagnetic spacer separating two magnetic layers was investigated. It is shown, that the structure with number of pillars gives a higher value of Giant Magnetoresistance (GMR) effect rather than a structure with one pillar of equivalent diameter. The inhomogeneity of spin currents, which has one of the strongest impacts on GMR effect value leads to the occurrence of spin-current vortices. Introduction of lT and lL lengths in Waintal model gives a better description of angular dependence of GMR effect rather than Levy-Fert model.
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DAS, PROLOY TARAN, and Tapan Kumar Nath. "Investigation of Structural, Magneto-transport, and Electronic properties of Pr0.7Sr0.3MnO3 nanoparticle." JOURNAL OF ADVANCES IN PHYSICS 7, no. 3 (February 23, 2015): 1906–15. http://dx.doi.org/10.24297/jap.v7i3.1598.

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In this report Micro-structural, magnetic, electronic, and magneto-transport properties of perovskite Pr0.7Sr0.3MnO3 manganite nanoparticles have been thoroughly investigated. A series of samples with different particle size (Φ) is synthesized by chemical ‘pyrophoric’ reaction process. Rietveld refinement of X-Ray diffraction pattern of the sample showed single phase orthorhombic structure with Pbnm space group. Metal- insulator transition () has been observed in the temperature range of 180-200 K in zero field resistivity data (2 – 300 K) and it differs from ferromagnetic to paramagnetic transition temperature () due to enhanced surface disorder effect. The lowest nanomentric sample exhibit maximum 85 % magneto-resistances under 8 T magnetic field at 4 K. Magneto-impedance measurement of the Pr0.7Sr0.3MnO3 nano particles have been obtained at 0.8 T in the temperature range 80-300 K. The magneto transport properties has been explored with spin polarized tunneling and spin dependent scattering of single ferromagnetic domain with nanometric grain size modulation. We have analyzed temperature dependent resistivity data using small polaron hopping and variable range hopping models. Below < 40 K a resistivity upturn behavior exhibiting a distinct resistivity minimum has been observed for each sample, which is best explained by electron-electron interaction and weak localization mechanism.Â
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Vikram, Amit, Guddadarangavvanahally K. Jayaprakasha, Palmy R. Jesudhasan, Suresh D. Pillai, and Bhimanagouda S. Patil. "Obacunone Represses Salmonella Pathogenicity Islands 1 and 2 in anenvZ-Dependent Fashion." Applied and Environmental Microbiology 78, no. 19 (July 27, 2012): 7012–22. http://dx.doi.org/10.1128/aem.01326-12.

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ABSTRACTObacunone belongs to a class of unique triterpenoids called limonoids, present inCitrusspecies. Previous studies from our laboratory suggested that obacunone possesses antivirulence activity and demonstrates inhibition of cell-cell signaling inVibrio harveyiandEscherichia coliO157:H7. The present work sought to determine the effect of obacunone on the food-borne pathogenSalmonella entericaserovar Typhimurium LT2 by using a cDNA microarray. Transcriptomic studies indicated that obacunone repressesSalmonellapathogenicity island 1 (SPI1), the maltose transporter, and the hydrogenase operon. Furthermore, phenotypic data for the Caco-2 infection assay and maltose utilization were in agreement with microarray data suggesting repression of SPI1 and maltose transport. Further studies demonstrated that repression of SPI1 was plausibly mediated throughhilA. Additionally, obacunone seems to repress SPI2 under SPI2-inducing conditions as well as in Caco-2 infection models. Furthermore, obacunone seems to represshilAin an EnvZ-dependent fashion. Altogether, the results of the study seems to suggest that obacunone exerts an antivirulence effect onS.Typhimurium and may serve as a lead compound for development of antivirulence strategies forS.Typhimurium.
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DIETL, TOMASZ. "DILUTED FERROMAGNETIC SEMICONDUCTORS — ORIGIN OF MAGNETIC ORDERING AND SPIN-TRANSPORT PROPERTIES." International Journal of Modern Physics B 22, no. 01n02 (January 20, 2008): 104–5. http://dx.doi.org/10.1142/s0217979208046116.

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In the first hour of the lecture the present understanding of the origin of exchange interaction and mechanisms leading to ferromagnetic order in diluted magnetic semiconductors will be presented.1 The lecture will start by discussing energy positions of relevant open magnetic shells, including the correlation energy and excitations within the magnetic ions. The origin and magnitude of sp–d exchange interactions will then be described. This will be followed by presenting the physics of indirect exchange interactions between localized spins contrasting magnetic characteristics in the absence and in the presence of free carriers. The Zener and RKKY models of ferromagnetism will be introduced and the role of confinement, dimensionality, and spin-orbit interaction in determining properties of the ferromagnetic phase will be outlined. The second lecture will be devoted to theory of spin transport in layered structures of diluted ferromagnetic semiconductors, emphasizing the issues important for perspective spintronics devices. A recently developed theory,2 which combines a multi-orbital empirical tight-binding approach with a Landauer–Büttiker formalism will be presented. In contrast to the standard kp method, this theory describes properly the interfaces and inversion symmetry breaking as well as the band dispersion in the entire Brillouin zone, so that the essential for the spin-dependent transport Rashba and Dresselhaus terms as well as the tunneling via k points away from the zone center are taken into account. The applicability of this model for the description of tunneling magnetoresistance (TMR), resonant tunneling spectra, spin-current polarization in Esaki-Zener diodes, and domain-wall resistance will be presented. Note from Publisher: This article contains the abstract only.
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Schuth, Nils, Stefan Mebs, Dennis Huwald, Pierre Wrzolek, Matthias Schwalbe, Anja Hemschemeier, and Michael Haumann. "Effective intermediate-spin iron in O2-transporting heme proteins." Proceedings of the National Academy of Sciences 114, no. 32 (July 24, 2017): 8556–61. http://dx.doi.org/10.1073/pnas.1706527114.

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Proteins carrying an iron-porphyrin (heme) cofactor are essential for biological O2 management. The nature of Fe-O2 bonding in hemoproteins is debated for decades. We used energy-sampling and rapid-scan X-ray Kβ emission and K-edge absorption spectroscopy as well as quantum chemistry to determine molecular and electronic structures of unligated (deoxy), CO-inhibited (carboxy), and O2-bound (oxy) hemes in myoglobin (MB) and hemoglobin (HB) solutions and in porphyrin compounds at 20–260 K. Similar metrical and spectral features revealed analogous heme sites in MB and HB and the absence of low-spin (LS) to high-spin (HS) conversion. Amplitudes of Kβ main-line emission spectra were directly related to the formal unpaired Fe(d) spin count, indicating HS Fe(II) in deoxy and LS Fe(II) in carboxy. For oxy, two unpaired Fe(d) spins and, thus by definition, an intermediate-spin iron center, were revealed by our static and kinetic X-ray data, as supported by (time-dependent) density functional theory and complete-active-space self-consistent-field calculations. The emerging Fe-O2 bonding situation includes in essence a ferrous iron center, minor superoxide character of the noninnocent ligand, significant double-bond properties of the interaction, and three-center electron delocalization as in ozone. It resolves the apparently contradictory classical models of Pauling, Weiss, and McClure/Goddard into a unifying view of O2 bonding, tuned toward reversible oxygen transport.
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Melson, Tobias, Hans-Thomas Janka, Alexander Summa, Robert Bollig, Andreas Marek, and Bernhard Müller. "Exploring the explosion mechanism of core-collapse supernovae in three dimensions." Proceedings of the International Astronomical Union 12, S329 (November 2016): 424. http://dx.doi.org/10.1017/s1743921317001181.

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AbstractWe present the first successful simulations of neutrino-driven supernova explosions in three dimensions (3D) using the Vertex-Prometheus code including sophisticated energy-dependent neutrino transport. The simulated models of 9.6 and 20 solar-mass iron-core stars demonstrate that successful explosions can be obtained in self-consistent 3D simulations, where previous models have failed. New insights into the supernova mechanism can be gained from these explosions. The first 3D model (Melson et al. 2015a) explodes at the same time but more energetically than its axially symmetric (2D) counterpart. Turbulent energy cascading reduces the kinetic energy dissipation in the cooling layer and therefore suppresses neutrino cooling. The consequent inward shift of the gain radius increases the gain layer mass, whose recombination energy provides the surplus for the explosion energy.The second explosion (Melson et al. 2015b) is obtained through a moderate reduction of the neutral-current neutrino opacity motivated by strange-quark contributions to the nucleon spin. A corresponding reference model without these corrections failed, which demonstrates how close current 3D models are to explosion. The strangeness adjustment is meant as a prototype for remaining neutrino opacity uncertainties.
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Marchant, Pablo, and Takashi J. Moriya. "The impact of stellar rotation on the black hole mass-gap from pair-instability supernovae." Astronomy & Astrophysics 640 (August 2020): L18. http://dx.doi.org/10.1051/0004-6361/202038902.

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Models of pair-instability supernovae (PISNe) predict a gap in black hole (BH) masses between ∼45 M⊙ and 120 M⊙, which is referred to as the upper BH mass-gap. With the advent of gravitational-wave astrophysics, it has become possible to test this prediction, and there is an important associated effort to understand which theoretical uncertainties modify the boundaries of this gap. In this work we study the impact of rotation on the hydrodynamics of PISNe, which leave no compact remnant, as well as the evolution of pulsational-PISNe (PPISNe), which undergo thermonuclear eruptions before forming a compact object. We perform simulations of nonrotating and rapidly rotating stripped helium stars in a metal-poor environment (Z⊙/50) in order to resolve the lower edge of the upper mass-gap. We find that the outcome of our simulations is dependent on the efficiency of angular momentum transport: models that include efficient coupling through the Spruit-Tayler dynamo shift the lower edge of the mass-gap upward by ∼4%, while simulations that do not include this effect shift it upward by ∼15%. From this, we expect that the lower edge of the upper mass-gap is dependent on BH spin, which can be tested as the number of observed BH mergers increases. Moreover, we show that stars undergoing PPISNe have extended envelopes (R ∼ 10 − 1000 R⊙) at iron-core collapse, making them promising progenitors for ultra-long gamma-ray bursts.
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Ghosal, Abhisek, Stefan Jellbauer, Rubina Kapadia, Manuela Raffatellu, and Hamid M. Said. "Salmonellainfection inhibits intestinal biotin transport: cellular and molecular mechanisms." American Journal of Physiology-Gastrointestinal and Liver Physiology 309, no. 2 (July 15, 2015): G123—G131. http://dx.doi.org/10.1152/ajpgi.00112.2015.

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Infection with the nontyphoidal Salmonella is a common cause of food-borne disease that leads to acute gastroenteritis/diarrhea. Severe/prolonged cases of Salmonella infection could also impact host nutritional status, but little is known about its effect on intestinal absorption of vitamins, including biotin. We examined the effect of Salmonella enterica serovar Typhimurium ( S. typhimurium) infection on intestinal biotin uptake using in vivo (streptomycin-pretreated mice) and in vitro [mouse (YAMC) and human (NCM460) colonic epithelial cells, and human intestinal epithelial Caco-2 cells] models. The results showed that infecting mice with wild-type S. typhimurium, but not with its nonpathogenic isogenic invA spiB mutant, leads to a significant inhibition in jejunal/colonic biotin uptake and in level of expression of the biotin transporter, sodium-dependent multivitamin transporter. In contrast, infecting YAMC, NCM460, and Caco-2 cells with S. typhimurium did not affect biotin uptake. These findings suggest that the effect of S. typhimurium infection is indirect and is likely mediated by proinflammatory cytokines, the levels of which were markedly induced in the intestine of S. typhimurium-infected mice. Consistent with this hypothesis, exposure of NCM460 cells to the proinflammatory cytokines TNF-α and IFN-γ led to a significant inhibition of biotin uptake, sodium-dependent multivitamin transporter expression, and activity of the SLC5A6 promoter. The latter effects appear to be mediated, at least in part, via the NF-κB signaling pathway. These results demonstrate that S. typhimurium infection inhibits intestinal biotin uptake, and that the inhibition is mediated via the action of proinflammatory cytokines.
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Lew, Virgilio L., and Robert M. Bookchin. "Ion Transport Pathology in the Mechanism of Sickle Cell Dehydration." Physiological Reviews 85, no. 1 (January 2005): 179–200. http://dx.doi.org/10.1152/physrev.00052.2003.

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Polymers of deoxyhemoglobin S deform sickle cell anemia red blood cells into sickle shapes, leading to the formation of dense, dehydrated red blood cells with a markedly shortened life-span. Nearly four decades of intense research in many laboratories has led to a mechanistic understanding of the complex events leading from sickling-induced permeabilization of the red cell membrane to small cations, to the generation of the heterogeneity of age and hydration condition of circulating sickle cells. This review follows chronologically the major experimental findings and the evolution of guiding ideas for research in this field. Predictions derived from mathematical models of red cell and reticulocyte homeostasis led to the formulation of an alternative to prevailing gradualist views: a multitrack dehydration model based on interactive influences between the red cell anion exchanger and two K+transporters, the Gardos channel (hSK4, hIK1) and the K-Cl cotransporter (KCC), with differential effects dependent on red cell age and variability of KCC expression among reticulocytes. The experimental tests of the model predictions and the amply supportive results are discussed. The review concludes with a brief survey of the therapeutic strategies aimed at preventing sickle cell dehydration and with an analysis of the main open questions in the field.
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Cubells, Jerònia, Oriol Marquet, and Carme Miralles-Guasch. "Gender and Age Differences in Metropolitan Car Use. Recent Gender Gap Trends in Private Transport." Sustainability 12, no. 18 (September 5, 2020): 7286. http://dx.doi.org/10.3390/su12187286.

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Urban mobility is currently undergoing significant changes in cities worldwide, as gendered mobilities are converging and automobility is on a downward trend among younger cohorts. The aim of this study was to examine the dynamics of gendered mobilities over generations and across three different urban contexts in the Barcelona Metropolitan Region (northeast Spain), in an effort to understand whether the mobility gender gap is closing and whether young adults have lowered their private transport levels. Generalized linear models were built to analyze travel survey data from the Working Day Mobility Survey (EMEF) to comprehend mobility changes between 2008 and 2018. The study identified a generational countertrend among new generations of young adults, who reported more sustainable mobility practices than their predecessors. Furthermore, results show a general trend towards gender convergence of travel behavior on the outskirts of the Barcelona Metropolitan Region, but also a tendency towards gender divergence in the core area of Barcelona City. Since the mobility gender gap is closer to convergence in those areas where private transport use is more widespread, future efforts towards achieving climate objectives should aim at decoupling such gender convergence from car-dependent built environments.
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Dissertations / Theses on the topic "Spin dependent transport models"

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Silva, José Felix Estanislau da. "Shot Noise e corrente dependentes de spin: modelo quântico." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-08032017-091450/.

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Nesta dissertação, fazemos a primeira investigação sobre flutuações em corrente e corrente média dependentes de spin em potenciais duplo e simples da estrutura Zn1-xMnxSe. Consideramos efeitos de campos magnético e elétrico externos à temperatura nula. Na presença de um campo magnético, a interação dos íons de Mn com elétrons de condução e valência (interação de troca sp-d) origina potenciais dependentes de spin para o transporte em Zn1-xMnxSe. Aqui, flutuações em corrente (\"shot noise\") e a corrente média são calculados usando o modelo quântico de transporte através do potencial dependente de spin é descrito por uma matriz s de espalhamento. Os elementos da matriz de espalhamento, i.e., as amplitudes de transmissão e reflexão, são determinados pelo método da matriz transferência. Nossos resultados indicam que estruturas de potenciais simples e duplos Zn1-xMnxSe agem como se fossem \"filtros de spin\" para corrente. Em determinadas faixas de parâmetros do sistema, \"shot noise\" pode complementar informações obtidas da corrente média
In this dissertation we investigation for the first time spin dependent-current and its fluctuations in double and single barrier potentials of the Zn1-xMn xSe structure sandwiched between ZnSe layers. We consider effects of external magnetic field, the interaction of the Mn ions with thew conduction and valence electrons (sp-d exchange interation) give rises to spin-dependent potentials for transport across the Zn1-xMn xSe layer. Here, the average current and its fluctuations are calculated using the quantum transport model in which transport across the spin-dependent potential is described via scattering matrix s. The elements of the scattering matrix, i.e., the transmission and reflection amplitudes, are determined through the transfer-matrix method. Our results indicate date single and double potentials of the Zn1-xMn xSe structure act as \"spin filters\" for the current. Within some system parameter range, shot noise can supplement the information contained in the average current
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Sturma, Magali. "Modélisation par éléments finis des dispositifs pour la spintronique : couplage auto-cohérent des équations du micromagnétisme et du transport dépendant du spin." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAY032/document.

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Cette thèse s'inscrit dans le contexte de l'électronique de spin et traite plus particulièrement de l'interaction réciproque entre un courant polarisé en spin et l'aimantation des structures magnétiques. Au cours de ce travail, les équations du transport diffusif dépendant du spin ont été couplées de façon auto-cohérente à l'équation de la dynamique d'aimantation dans l'approche micromagnétique au sein du code éléments finis. Cet outil numérique est appliqué à l'étude de la dynamique de parois de domaines dans différentes géométries sous l'action d'un courant polarisé. Il a permis de mettre en évidence plusieurs nouveaux phénomènes liés à l'interaction mutuelle entre l'aimantation et les spins des électrons. Pour des rubans à section rectangulaire, l'impact de cette interaction, habituellement négligée dans les modèles simplifiés, est quantifié via le calcul de la vitesse de déplacement de parois et du courant critique de Walker. Ces paramètres ont été étudiés en fonction de la largeur de paroi, du courant appliqué et des longueurs caractéristiques du transport polarisé en spin. L'augmentation du paramètre de non-adiabaticité du système, liée à l'augmentation du gradient d'aimantation ainsi qu'à une forte non-localité du modèle couplé, a été démontrée. Pour des fils à section circulaire et à diamètre modulable, une contribution supplémentaire à la non-adiabaticité du système liée, à la géométrie confinée, a été mise en évidence. Puis, les différents régimes dynamiques ainsi que les conditions de dépiégage de la paroi ont été caractérisés en fonction de la taille de constrictions
In the context of spintronics this thesis studies the mutual interaction between a spin polarised current and the magnetization of magnetic structures. During this work, the diffusive spin transport equations were coupled in a self-consistent manner with the magnetization dynamics equations in the micromagnetic approach in our homemade finite element code. This numerical tool applied to the study of domain walls dynamics in different geometries under the action of spin polarized current highlighted several new phenomena related to the mutual interaction between the magnetization and the spins of electrons. For rectangular cross section stripes, the impact of this interaction, usually neglected in simplified models, is quantified by the computation of the domain wall velocity and the Walker critical current. These quantities were studied as a function of the domain wall width, the applied current, and the spin polarised transport characteristic lengths. Increasing the non-adiabatic parameter of the system related to the increase in the magnetization gradient and a strong non-locality of the coupled model was demonstrated. For circular cross section wires with a modulated diameter, an additional contribution to the non-adiabaticity of the system related to the confined geometry is highlighted. Then the different dynamic regimes and domain wall unpinning conditions are characterised according to the constriction size
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Sandschneider, Niko. "Strominduziertes Schalten der Magnetisierung." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2009. http://dx.doi.org/10.18452/16035.

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Die vorliegende Arbeit beschäftigt sich mit der mikroskopischen Modellierung von strominduziertem Schalten der Magnetisierung in magnetischen Tunnelstrukturen. Die Tunnelstruktur besteht aus zwei durch einen nichtmagnetischen Isolator voneinander getrennten Ferromagneten und einem Paramagneten, der als Elektronenreservoir dient. Die Ferromagnete werden beide durch das Hubbard-Modell beschrieben. Durch Anlegen einer Spannung verschieben sich die chemischen Potentiale auf beiden Seiten des Isolators, wodurch ein endlicher Tunnelstrom entsteht. Dieser wird im Rahmen des Modells durch eine Hybridisierung zwischen benachbarten Schichten simuliert. Das Modell muss im Nichtgleichgewicht gelöst werden, da aufgrund der unterschiedlichen chemischen Potentiale thermodynamisches Gleichgewicht nicht angenommen werden darf. Daher wird zur analytischen Auswertung der Keldysh-Formalismus verwendet, der eine Erweiterung der Viel-Teilchen-Theorie ins Nichtgleichgewicht darstellt. Da es sich beim Hubbard-Modell um ein nicht exakt lösbares Viel-Teilchen-Modell handelt, wurde in der Arbeit eine approximative Lösung, der sogenannte Nichtgleichgewichtsspektraldichteansatz, entwickelt. Dieser beruht auf einer Hochenergieentwicklung der retardierten Greenfunktion mit Hilfe der exakt berechenbaren Spektralmomente. Die numerischen Resultate stimmen qualitativ mit dem Experiment überein. Insbesondere gelingt es, das Hystereseverhalten der Magnetisierung des freien Ferromagneten in Abhängigkeit der angelegten Spannung korrekt zu reproduzieren. Es kann somit allein durch Anlegen einer Spannung kontrolliert zwischen paralleler und antiparalleler Ausrichtung der Magnetisierungen geschaltet werden. Dieses Phänomen ist anhand der entsprechenden Quasiteilchenzustandsdichten erklärbar. Weiterhin wird das Verhalten der kritischen Spannung systematisch in Form von Phasendiagrammen dargestellt und diskutiert.
This thesis is concerned with the microscopic modelling of current-induced switching of magnetization in magnetic tunnel junctions. The tunnel junction consists of two ferromagnets which are divided by a nonmagnetic insulator and a paramagnet, which acts as an electron reservoir. The ferromagnets are both described by the Hubbard model. By applying a voltage the chemical potentials on both sides of the insulator are shifted which results in a finite tunneling current. Within the model the current is simulated by a hybridization between neighbouring regions. The model has to be solved in non-equilibrium since thermal equilibrium requires a constant chemical potential for the whole system, which is not the case due to the voltage. Thus the Keldysh formalism will be used for evaluating the model. Since the Hubbard model is not exactly solvable one needs approximations. In this work a non-equilbrium spectral density approach is developed. It is based on a high-energy expansion of the retarded Green''s function and takes interactions beyond the mean field level into account. The numerical results of the theory are in qualitative agreement with experiments. It will be shown that it is possible to correctly get the hysterisis behaviour of the magnetization of the free ferromagnet in dependence on the applied voltage. Thus the relative alignment of the two magnetizations can be switched just by applying an electric field. This can be explained with the corresponding quasiparticle densities of state. Furthermore the behaviour of the critical voltage will be discussed systematically by calculating phase diagrams of the tunnel junction.
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Lee, Robert Frank. "Spin dependent transport in solids." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615695.

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Michel, Christoph. "Theoretical studies of spin dependent transport phenomena [transport in magnetic semiconductors ; spin dependent charge carrier recombination]." Göttingen Cuvillier, 2007.

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Dhandapani, Dhanalakshmi. "Spin Dependent Transport in Organic Materials." Thesis, University of Sheffield, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.522047.

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Jiang, Wenchao. "Spin dependent transport in ferromagnetic particles." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52204.

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Spintronics is an emerging technology that arises from the interplay between spin of the charge carrier and the magnetic property of the materials. The miniaturization of spintronic devices requires a deep understanding of ferromagnetic materials at the nanometer scale. This thesis studies the properties of ferromagnetic particles (2-5nm in diameter) using electron transport measurements. A technique to fabricate nanoparticle devices and incorporate microwave in the electron tunneling measurement of the particles is presented. Repeated microwave pulses can directly excite the magnetization of the particles without heating the electrons. Results of the transport measurements on Co particles will be discussed, which demonstrate that electron tunneling through a ferromagnetic particle can induce magnetization excitations in that particle. A physical model regarding the mesoscopic fluctuations is presented to address the current driven magnetization noise. Numerical simulations based on that model are performed to explain the experimental data and validate the model. Electron transport measurements on Ni, Fe, and Ni??Fe?? are conducted. The hysteretic behaviors of the particles in presence of electron tunneling have strong material dependence, which is mainly due to the magnetic shape anisotropy. Electron tunneling is a main source of magnetization noise, while other sources still need to be identified. Some data we collected from literature will be included in this thesis as an appendix.
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Blundell, Stephen John. "Spin-dependent transport in artificial structures." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309331.

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Yi, Ji. "Spin-dependent transport through point-contacts." Available to US Hopkins community, 2003. http://wwwlib.umi.com/dissertations/dlnow/3080691.

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Gul, Y. "Spin dependent transport in semiconductor nanostructures." Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10050201/.

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This project investigates transport properties of electrons and holes con- fined into one-dimensional regions using lithographically patterned surface gates in In0.75Ga0.25As and p-type Ge quantum wells respectively. A series of transport experiments was conducted to investigate many body effects in electrons and holes in one dimension. The experimental results provided here show important advances in both In0.75Ga0.25As and p-type Ge quan- tum wires and lays the ground work for future experiments for spintronics research using these materials. The first experiments reported here (chapter 4) describes the experiments carried out to optimise fabrication methods and determine the ideal length scales of split gates to observe clear ballistic transport features in high mobility In0.75Ga0.25As wafers. The following chapter (chapter 5) summarises the one dimensional trans- port measurements carried out on narrow split gates fabricated on the high mobility In0.75 Ga0.25 As quantum wells. It explores how Rashba spin or- bit coupling effects the transport properties. In In0.75Ga0.25As a weaker backscattering due to the time-reversal asymmetry in the one-dimensional channel results in enhanced ballistic transport characteristics with clear quantised conductance plateaus up to 6(2e2/h). We investigate the con- ductance data when a d.c. voltage is applied to the source and the drain contacts and a method for obtaining the effective g factor is described. Chapter 6 introduces p-type Ge, and summarises one dimensional transport properties of these devices. We demonstrate quantised conductance up to 10 (2e2/h). Applied source-drain voltages and symmetric gating of the channel has uncovered plateau at half integer values as well as ballistic structure down to 0.25(2e2/h). These systems also show a ballistic plateau at 0.25 (2e2/h), when the carrier density is reduced using a top gate electrode. The last experimental chapter (chapter 7) analyses the many-body effects observed in one-dimensional transport measurements in p-Ge and analysis of anomalous 0.25 (2e2/h) plateau is provided with possible explanations for it. We have also shown that we can alter the confining potential using lateral gate voltages to create a row formation as the ground state effectively creates a Wigner lattice.
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Books on the topic "Spin dependent transport models"

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Aral, M. M. Analytical solutions for two-dimensional transport equation with time-dependent dispersion coefficients. Atlanta, Ga: Multimedia Environmental Simulations Laboratory, School of Civil and Environmental Engineering, Georgia Institute of Technology, 1996.

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R, Pynn, Riste Tormod 1925-, and North Atlantic Treaty Organization. Scientific Affairs Division., eds. Time-dependent effects in disordered materials. New York: Plenum Press, 1987.

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1946-, Maekawa S., and Shinjō Teruya 1938-, eds. Spin dependent transport in magnetic nanostructures. Boca Raton: CRC Press, 2002.

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Shinjo, Teruya, and Sadamichi Maekawa, eds. Spin Dependent Transport in Magnetic Nanostructures. CRC Press, 2002. http://dx.doi.org/10.1201/9781420024579.

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S, Maekawa, and Shinjo Teruya 1938-, eds. Spin dependent transport in magnetic nanostructures. London: Taylor & Francis, 2002.

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Golizadeh-Mojarad, Roksana, and Supriyo Datta. NEGF-based models for dephasing in quantum transport. Edited by A. V. Narlikar and Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533046.013.3.

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This article describes the use of NEGF-based models for elastic dephasing in quantum transport. The non-equilibrium Green's function (NEGF) method provides a rigorous prescription for including any kind of dephasing mechanisms to any order starting from a microscopic Hamiltonian through an appropriate choice of the self-energy function. The article first introduces the general approach to quantum transport that provides a general method for modelling a wide class of nanotransistor and spin devices. It then discusses the effect of different types of dephasing on momentum and spin relaxation before considering three simple phenomenological choices of the self-energy function that allows one to incorporate spin, phase and momentum relaxation independently. It also looks at an example that takes into account these three types of dephasing mechanisms: the ‘spin-Hall’ effect.
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Hawi-Ping, Cheng, and National Risk Management Research Laboratory (U.S.), eds. 3DHYDROGEOCHEM, a 3-Dimensional model of density-dependent subsurface flow and thermal multispecies-multicomponent HYDROGEOCHEMical transport: Project summary. Ada, OK: U.S. Environmental Protection Agency, National Risk Management Research Laboratory, 1999.

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Hawi-Ping, Cheng, and National Risk Management Research Laboratory (U.S.), eds. 3DHYDROGEOCHEM, a 3-Dimensional model of density-dependent subsurface flow and thermal multispecies-multicomponent HYDROGEOCHEMical transport: Project summary. Ada, OK: U.S. Environmental Protection Agency, National Risk Management Research Laboratory, 1999.

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Hawi-Ping, Cheng, and National Risk Management Research Laboratory (U.S.), eds. 3DHYDROGEOCHEM, a 3-Dimensional model of density-dependent subsurface flow and thermal multispecies-multicomponent HYDROGEOCHEMical transport: Project summary. Ada, OK: U.S. Environmental Protection Agency, National Risk Management Research Laboratory, 1999.

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Hawi-Ping, Cheng, and National Risk Management Research Laboratory (U.S.), eds. 3DHYDROGEOCHEM, a 3-Dimensional model of density-dependent subsurface flow and thermal multispecies-multicomponent HYDROGEOCHEMical transport: Project summary. Ada, OK: U.S. Environmental Protection Agency, National Risk Management Research Laboratory, 1999.

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Book chapters on the topic "Spin dependent transport models"

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Butler, William. "Spin-Dependent Transport in Magnetic Multilayers." In Magnetic Interactions and Spin Transport, 185–217. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4615-0219-7_3.

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Bułka, Bogdan R., Tomasz Kostyrko, Stanisław Lipiński, and Piotr Stefański. "Spin-Dependent Electronic Transport through Molecular Devices." In Molecular Nanowires and Other Quantum Objects, 307–18. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2093-3_28.

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Heer, R., J. Smoliner, J. Bornemeier, and H. Brückl. "Temperature Dependent Transport in Spin Valve Transistor Structures." In Nonequilibrium Carrier Dynamics in Semiconductors, 159–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-36588-4_35.

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Kruchinin, S. P., S. P. Repetsky, and I. G. Vyshyvana. "Spin-Dependent Transport of Carbon Nanotubes with Chromium Atoms." In Nanomaterials for Security, 67–95. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-017-7593-9_7.

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Ishizuka, Hiroaki. "Models and Methods." In Magnetism and Transport Phenomena in Spin-Charge Coupled Systems on Frustrated Lattices, 27–34. Tokyo: Springer Japan, 2015. http://dx.doi.org/10.1007/978-4-431-55663-3_2.

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Huang, Xu-Guang, Jinfeng Liao, Qun Wang, and Xiao-Liang Xia. "Vorticity and Spin Polarization in Heavy Ion Collisions: Transport Models." In Strongly Interacting Matter under Rotation, 281–308. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-71427-7_9.

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Tsukagoshi, Kazuhito, Kenichi Oto, Sadao Takaoka, Kazuo Murase, Yukihiko Takagaki, Kenji Gamo, and Susumu Namba. "Spin-Dependent Nonlocal Quantum Transport Influenced by Gate Voltage in GaAs/AlGaAs Wires." In Science and Technology of Mesoscopic Structures, 199–204. Tokyo: Springer Japan, 1992. http://dx.doi.org/10.1007/978-4-431-66922-7_20.

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Lam, D. C. L., C. R. Murthy, and R. B. Simpson. "Marching Technique Solutions for Straight Plume Equations: Effects of Scale Dependent Diffusivity." In Effluent Transport and Diffusion Models for the Coastal Zone, 53–77. New York Inc.: Springer-Verlag, 2013. http://dx.doi.org/10.1002/9781118663561.ch4.

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Li, Lu-Ping, Bradley Hack, Erdmann Seeliger, and Pottumarthi V. Prasad. "MRI Mapping of the Blood Oxygenation Sensitive Parameter T2* in the Kidney: Basic Concept." In Methods in Molecular Biology, 171–85. New York, NY: Springer US, 2021. http://dx.doi.org/10.1007/978-1-0716-0978-1_10.

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AbstractThe role of hypoxia in renal disease and injury has long been suggested but much work still remains, especially as it relates to human translation. Invasive pO2 probes are feasible in animal models but not for human use. In addition, they only provide localized measurements. Histological methods can identify hypoxic tissue and provide a spatial distribution, but are invasive and allow only one-time point. Blood oxygenation level dependent (BOLD) MRI is a noninvasive method that can monitor relative oxygen availability across the kidney. It is based on the inherent differences in magnetic properties of oxygenated vs. deoxygenated hemoglobin. Presence of deoxyhemoglobin enhances the spin–spin relaxation rate measured using a gradient echo sequence, known as R2* (= 1/T2*). While the key interest of BOLD MRI is in the application to humans, use in preclinical models is necessary primarily to validate the measurement against invasive methods, to better understand physiology and pathophysiology, and to evaluate novel interventions. Application of MRI acquisitions in preclinical settings involves several challenges both in terms of logistics and data acquisition. This section will introduce the concept of BOLD MRI and provide some illustrative applications. The following sections will discuss the technical issues associated with data acquisition and analysis.This chapter is based upon work from the COST Action PARENCHIMA, a community-driven network funded by the European Cooperation in Science and Technology (COST) program of the European Union, which aims to improve the reproducibility and standardization of renal MRI biomarkers. This introduction chapter is complemented by two separate chapters describing the experimental procedure and data analysis.
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Herbert, Bruce E., and Paul M. Bertsch. "A 19F and 2H NMR Spectroscopic Investigation of the Interaction Between Nonionic Organic Contaminants and Dissolved Humic Material." In Nuclear Magnetic Resonance Spectroscopy in Environment Chemistry. Oxford University Press, 1997. http://dx.doi.org/10.1093/oso/9780195097511.003.0009.

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Interaction between nonionic organic contaminants (NOC) and natural organic matter strongly influences the fate and transport of NOC in the environment. Microscopic descriptions of NOC-organic matter interaction have been developed based on macroscopic observations of NOC sorption to organic matter and organic solute transport under varying conditions. These models include the partitioning concept describing NOC sorption to organic matter and the concept of intra-organic matter diffusion used to account for nonequilibrium organic solute transport; however, little microscopic information exists to validate them. NMR may be a powerful method to gain information and insight concerning NOC-organic matter interaction. Chemical shifts, linewidths, and the magnitude of spin-spin couplings exhibited in the NMR spectra of a given nucleus are dependent on the characteristics of the surrounding media and therefore can be used to study the NOC-organic matter interaction. NMR characterization of the chemical interaction between NOC and organic matter can potentially provide information on important aspects of the sorption mechanism. This information may be useful to explain the influence of organic matter characteristics on NOC sorption and the mechanisms controlling nonequilibrium sorption of NOC to organic matter and mineral phases, and to evaluate different conceptual models of natural humic material, including the polymer concept, where humics are considered to be flexible linear polyelectrolytes, and the micelle concept, which considers humics to be aggregates of simple organic compounds, oligomers, and humic molecules ultimately forming micellar-type structures. NMR has been used to study the interactions of small organic solutes with macromolecules and organized organic assemblies. Fluorine-19 NMR has been particularly useful to study these interactions because this magnetically active nucleus is 100% abundant, has a high sensitivity (83% of 1H) and large chemical shift range, and exhibits no background signal. Several NMR studies have followed the interactions between fluorinated anesthetics and phospholipids, sodium dodecyl sulfate (SDS) micelles, and intact rabbit brain tissue. Generally, these studies have indicated both that sorption sites are less polar than aqueous solutions and that there is decreased mobility of the sorbed solute. Fluorine-19 NMR has also been used to characterize the interactions between fluorine-containing ligands, such as fluorotryptophan, and human serum albumin (HSA).
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Conference papers on the topic "Spin dependent transport models"

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Van Dorpe, Pol, Wim Van Roy, Jo De Boeck, and Gustaaf Borghs. "Spin dependent transport properties in spin-LEDs: a survey." In Integrated Optoelectronic Devices 2005, edited by Manijeh Razeghi and Gail J. Brown. SPIE, 2005. http://dx.doi.org/10.1117/12.582683.

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Ono, Keiji, and Seigo Tarucha. "Nuclear spin dependent transport in quantum dots." In 2003 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2003. http://dx.doi.org/10.7567/ssdm.2003.e-5-1.

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Jian-Chun Wu, Xue-Feng Wang, Liping Zhou, Shuo-Wang Yang, and Zhen-Ya Li. "Spin dependent transport in [CpFeCpV]n molecule wires." In 8th International Vacuum Electron Sources Conference and Nanocarbon (2010 IVESC). IEEE, 2010. http://dx.doi.org/10.1109/ivesc.2010.5644438.

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Zhou, Shengqiang, G. Abrasonis, A. Mücklich, K. Potzger, J. Fassbender, M. Helm, and H. Schmidt. "Spin-dependent transport in hard superparamagnetic C:Ni nanocomposites." In SPIE Europe Microtechnologies for the New Millennium, edited by Achim Wixforth. SPIE, 2009. http://dx.doi.org/10.1117/12.821465.

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Asahara, H., T. Kanaki, S. Ohya, and M. Tanaka. "Spin-Dependent Transport of Ferromagnetic-Semiconductor GaMnAs-Based Lateral Spin-Valve Devices." In 2017 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2017. http://dx.doi.org/10.7567/ssdm.2017.ps-12-09.

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Eriksson, Mark A. "Spin-dependent transport in silicon/silicon-germanium quantum dots." In 2008 IEEE Silicon Nanoelectronics Workshop (SNW). IEEE, 2008. http://dx.doi.org/10.1109/snw.2008.5418452.

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GRUBIN, H. L., and H. L. CUI. "SPIN DEPENDENT TRANSPORT IN QUANTUM AND CLASSICALLY CONFIGURED DEVICES." In Proceedings of the WOFE-04. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812773081_0040.

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Ignatenko, S. A. "Modeling of spin-dependent transport in ferromagnet/insulator/ferromagnet structures." In 2004 14th International Crimean Conference "Microwave and Telecommunication Technology". IEEE, 2004. http://dx.doi.org/10.1109/crmico.2004.183325.

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Ghosh, A. "Spin-dependent Non-equilibrium Transport in Mesoscopic 2D Electron Systems." In PHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors - ICPS-27. AIP, 2005. http://dx.doi.org/10.1063/1.1994583.

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Sidorova, Tatiana N., Alexander L. Danilyuk, Vviktor E. Borisenko, F. Arnaud d'Avitaya, and J. L. Lazzari. "Spin-dependent transport of electrons through ferromagnetic/insulator/semiconductor nanostructures." In Nano-Design, Technology, Computer Simulations, edited by Alexander I. Melker and Vladislav V. Nelayev. SPIE, 2008. http://dx.doi.org/10.1117/12.836170.

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Reports on the topic "Spin dependent transport models"

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Di Ventra, Massimiliano. Time-dependent current-density-functional theory of charge, energy and spin transport and dynamics in nanoscale systems. Final Report. Office of Scientific and Technical Information (OSTI), June 2019. http://dx.doi.org/10.2172/1524794.

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Time-dependent Data System (TDDS); an interactive program to assemble, manage, and appraise input data and numerical output of flow/transport simulation models. US Geological Survey, 1996. http://dx.doi.org/10.3133/wri964143.

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