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Dissertations / Theses on the topic 'Nano-magnetism'

Author: Grafiati
Published: 11 March 2023
Last updated: 31 July 2025

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1

Cook, James. "Optical magnetism with metallic nano-composites." Thesis, University of Surrey, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616915.

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The transmission and effective magnetic properties of a metamaterial consisting of silver nanowires that we call a "silver nanoforest" was investigated using finite element numerical simulations in the optical regime. The variation of these properties with the arrangement and size of the nanowires was also investigated along with resilience to fabrication disorder. The silver nanoforest metamaterial exhibited low loss diamagnetism associated with Fabry Perot interference. In addition to diamagnetism both negative pelmeability and negative refractive index were obtained, but not simultaneously
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2

Persson, Andreas. "X-ray Absorption Spectroscopy on Nano-Magnet Arrays and Thin Films : Magnetism and Structure." Doctoral thesis, Uppsala universitet, Yt- och gränsskiktsvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-112824.

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The magnetic and structural properties of nano magnet arrays and ferromagnetic thin films are investigated. Circular x-rays are used and extensive use is made in this Thesis of the X-ray Magnetic Circular Dichroism (XMCD) technique. By means of the XMCD magneto-optic sum rules the values of the orbital and spin moments are determined. In the case of the nano magnet arrays studied, the XMCD technique is used in a spatially resolved mode using Photo Electron Emission Microscopy (PEEM) after circular light excitation. The Extended X-ray Absorption Fine Structure (EXAFS) is studied in both the Co
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3

Maurer, Thomas. "Magnetism of anisotropic nano-objects : magnetic and neutron studies of Co1-xNix nanowires." Paris 11, 2009. http://www.theses.fr/2009PA112340.

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Le nanomagnétisme est actuellement un champ d'investigation très actif grâce aux développements de méthodes de synthèse et d'investigation originales. Cette thèse s'attache à sonder le magnétisme de nanofils magnétiques synthétisés par un procédé polyol. Ce procédé présente l'avantage de fournir un large éventail d'objets magnétiques anisotropes présentant une très bonne qualité cristalline. Les nanofils ainsi synthétisés présentent des diamètres variant de 7nm à 20nm, leur conférant un mode de renversement de l'aimantation cohérent. Cette thèse montre que les nanofils ainsi synthétisés ont de
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4

Lima, Valquiria Fernanda Gonçalves de. "Preparação e caracterização de nanopartículas magnéticas de Sm-Co, Nd-Fe-B, Fe-Pt e Co-Pt pelo método de agregação gasosa." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-26112014-135553/.

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Atualmente, nanopartículas (NPs) são utilizadas em todos os ramos da tecnologia. Suas promissoras aplicações envolvem entre outros, o campo dos sensores e transdutores, mídia de gravação magnética, carreadores magnéticos de drogas medicinais. Com o objetivo de produzir NPs pelo método físico, um gerador de nanopartículas foi adaptado usando um dos canhões do sistema de magnetron sputtering, baseando-se no método de agregação gasosa. Com o gerador somos capazes de produzir NPs de diversos materiais e codepositá-las em matrizes dielétricas ou metálicas. Neste trabalho apresentamos o desenvolvime
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5

Lifvenborg, Louise. "Fabrication and characterization of novel nano-magnets." Thesis, Uppsala universitet, Molekyl- och kondenserade materiens fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-420995.

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Magnetic data storing has been of great interest since 1950 when the first magnetic hard drive was fabricated. A lot has happened since then, but there is still a need for smaller and cheaper devices.  One way to achieve this is by creating nano-sized ferromagnetic areas in a thin film at room temperature, or nano-magnets. In this thesis, the aim is to fabricate and characterize novel amorphous nano-magnets. Using a chromium mask ions can be implanted in a nano-sized pattern in an amorphous iron zirconium thin film. The mask is fabricated by depositing chromium over the iron zirconium and etch
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6

Mosca, Conte Adriano. "Quantum mechanical modeling of nano magnetism : new tools based on density-functional-theory with case applications to solids, surfaces, wires, and molecules." Doctoral thesis, SISSA, 2007. http://hdl.handle.net/20.500.11767/3935.

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The basis of density functional theory and its extension to magnetic systems is reviewed in the first chapter. The second chapter describes the implementation of the fully relativistic ultrasoft pseudopotential method whose predictive power is tested by calculating the spin-orbit splitting in the band structure of two bulk systems: Au-fcc and Pt-fcc. In the third chapter the magnetic properties of several Co based nanostructures are described as a function of their dimensionality, going from 2D to 0D systems. Finally, in the fourth chapter, the physical properties of a novel class of molecu
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7

Delshadi, Sarah. "Tests de diagnostic immunologique rapides combinant des nanoparticules magnétiques et des micro-aimants structurés." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAV070.

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Cette thèse présente le développement de tests immunologiques innovants, rapides et sensibles combinant des nanoparticules superparamagnétiques (SPN) fonctionnalisées et des micro-aimants : nos immuno-essais magnétiques exploitent les forts gradients de champ magnétique de ces micro-aimants pour capturer les complexes immunologiques liés aux SPN. L’attraction magnétique est souvent utilisée en biotechnologies car elle peut générér des forces capables de capturer des molécules d’intérêt. Les immuno-essais sur billes utilisent habituellement des aimants centi- et millimétriques pour capturer des
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8

Panighel, Mirco. "Adsorption, metalation and magnetic properties of tetra phenyl porphyrins on metal surfaces." Doctoral thesis, Università degli studi di Trieste, 2015. http://hdl.handle.net/10077/10898.

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2013/2014<br>Traditional semiconductor technology will reach a size limit within the next few years. A possible solution could be the use of organic molecules in technological applications as single functional units in metal-organic based devices; the success of this approach strongly depends on the understanding of the behaviour of these molecules on metallic surfaces. The interaction with metallic substrates and the interaction between the molecules themselves determine the electronic and magnetic properties of the system, and it is thus of fundamental interest to study these metal-organic i
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9

Bonetti, Stefano. "Magnetization Dynamics in Nano-Contact Spin Torque Oscillators : Solitonic bullets and propagating spin waves." Doctoral thesis, KTH, Materialfysik, MF, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-26955.

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Magnetization dynamics in nano-contact spin torque oscillators (STOs) is investigated from an experimental and theoretical point of view. The fundamentals of magnetization dynamics due to spin transfer torque are given. A custom-made high frequency (up to 46 GHz) in large magnetic fields (up to 2.2 T) microwave characterization setup has been built for the purpose and described in this thesis. A unique feature of this setup is the capability of applying magnetic fields at any direction θe out of the sample plane, and with high precision. This is particularly important, because the (average) o
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10

Sá, Artur Domingues Tavares de 1985. "Nano-agregados metálicos = produção e propriedades magnéticas." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/276993.

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Orientador: Varlei Rodrigues<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin<br>Made available in DSpace on 2018-08-23T00:51:37Z (GMT). No. of bitstreams: 1 Sa_ArturDominguesTavaresde_D.pdf: 7427611 bytes, checksum: 5f7375c13b84237cc30bec5c926f2f65 (MD5) Previous issue date: 2013<br>Resumo: Clusters, i.e. nanopartículas formadas por alguns átomos ou até 107, atraem grande interesse devido 'as propriedades peculiares que apresentam, como momento magnético aumentado, atividade catalítica, fluorescência dependente de tamanho e estruturas geométricas di
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11

Vergnaud, Céline. "Optimisation de la croissance de MoSe2 - WSe2 par épitaxie de Van der Waals pour la valleytronique." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALY038.

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Cette thèse a pour objet l’optimisation de la croissance par épitaxie par jets moléculaires dans le régime de van der Waals de couches semi-conductrices bidimensionnelles (2D) de diséléniures de métaux de transition (MoSe2, WSe2) pour les études magnéto-optiques et électriques. Cette optimisation passe par l’amélioration de la qualité cristallographique des couches sur de grandes surfaces en ajustant les paramètres de croissances (température et flux). En particulier, la maîtrise de l’état de surface du substrat est déterminante sur les mécanismes de croissance de ces couches. L’élaboration de
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12

Khelfallah, Malika. "Magnetic properties of ferrofluids of self-assembled nano-magnets." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS502.

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Cette thèse a pour objectif principal d'explorer les effets de l’assemblage créé par les interactions magnétiques dipolaires entre des nanoparticules magnétiques en suspension colloïdales dans un liquide (ferrofluide) sur les propriétés magnétiques de ce ferrofluide. Ce travail se base sur la caractérisation approfondie de ferrofluides constitués de nanoparticules en forme de fleurs composées de matériaux magnétiques durs tels que la ferrite de cobalt (CoFe2O4), ou de matériaux magnétiques mous comme la ferrite de manganèse (MnFe2O4) et la maghémite (γ-Fe2O3). Les propriétés magnétiques de ces
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13

Burgos, Parra Erick Omar. "Time resolved and time average imaging of magnetic nano-structures." Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/34251.

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The ability of a ferromagnet to maintain its magnetic state in the absence of an external magnetic field has made ferromagnetic materials an important subject of study in physics since the end of the 19th century. Moreover, ferromagnetic materials are the cornerstone for data storage systems such as magnetic tapes, magnetic disk drives and magnetic random access memory. The discovery of the Giant Magneto Resistance (GMR) in 1988 suggested that, since the magnetic state of the electrical conductor has an important effect upon the current flow, there may also be an inverse influence of the curre
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14

Alqannas, Haifa Saleh. "The Jahn Teller and surface interactions in C₆₀ nano systems." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14609/.

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Scanning Tunnelling Microscopy (STM) is the fastest possible method of imaging the molecular orbitals of the C[subscript]60 anions with resolution at the single atom level. For the particular anions of fullerene C[subscript]60, the splitting of the molecular orbitals due to the internal Jahn-Teller effects (JT) add further difficulties in understanding the published experimental images. In the current work, the effect of JT interaction on STM recorded images is studied. For higher charged states, the Coulomb interaction affects the distribution of electrons around the ion, and then as a conseq
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15

Hamadeh, Abbass. "Synchronization of spin trasnsfer nano-oscillators." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112262/document.

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Les nano-Oscillateurs à transfert de spin (STNOs) sont des dispositifs capables d'émettre une onde hyperfréquence lorsqu'ils sont pompés par un courant polarisé grâce au couple de transfert de spin. Bien qu'ils offrent de nombreux avantages (agilité spectrale, intégrabilité, etc.) pour les applications, leur puissance d'émission et leur pureté spectrale sont en général faibles. Une stratégie pour améliorer ces propriétés est de synchroniser plusieurs oscillateurs entre eux. Une première étape est de comprendre la synchronisation d'un STNO unique à une source externe. Pour cela, nous avons étud
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16

Menshawy, Samh. "Réponse dynamique d’un nano-oscillateur spintronique à un signal rf pour le développement de nouveaux détecteurs rf ultra-miniatures." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS076/document.

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Les nano-oscillateurs spintroniques présentent des propriétés remarquables en termes de détection radiofréquence. Leurs tailles nanométriques, leur fonctionnement à température ambiante et leurs compatibilité CMOS en font des candidats sérieux pour apporter la fonction d’analyse spectrale instantanée dans des systèmes embarqués. Les travaux de cette thèse portent sur les propriétés de détection des STNOs à base de vortex magnétiques. Un des effets conférant aux STNOs la possibilité de détecter un signal rf est l’effet diode de spin. Une source rf permet de créer le signal à détecter. Lorsque l
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17

Benchohra, Amina. "Magnetic molecular switches : from their synthesis to their integration into hybrid (nano)materials." Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS489.

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Les commutables moléculaires sont des molécules qui peuvent moduler leurs propriétés (physiques, chimiques) sous l'influence d'un stimulus externe). Les remarquables propriétés des objets ont suscité un vif intérêt dans l'électronique moléculaire, et plus généralement, dans le domaine des matériaux multifonctionnels. Ce projet de thèse s'est inscrit dans le cadre d'une première collaboration entre les équipes ERMMES et Polymères de l'Institut Parisien de Chimie Moléculaire (IPCM). L' objectif a consisté à développer des voies de synthèses générales de (nano)matériaux hybrides à partir de commu
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18

Zakhia, Georges. "Synthèse, caractérisation et propriétés magnétiques de nano-aimants moléculaires." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112071.

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Dans la première partie de ce travail de thèse, nous nous sommes intéressé à l’étude de l’anisotropie magnétique au sein de complexes mononucléaires de Ni(II) et de Co(II) pentacoordinés de géométrie allant de la pyramide à base carrée jusqu’à la bipyramide trigonale. Pour les complexes mononucléaires, nous avons montré que pour une géométrie donnée, la nature de l’ion métallique a une influence importante sur l’anisotropie magnétique.Nous avons étudié l’effet de la géométrie pour un même ion métallique. Dans le cas d’une géométrie bipyramidale trigonale (symétrie C3v), nous avons montré que l
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19

Mirza, Mueed. "Magnetism in Ni80Fe20 and Ni80Fe20/NiO Nano-stripes." 2012. http://hdl.handle.net/1993/8454.

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Ni80Fe20 and Ni80Fe20/NiO films and nano-stripes were characterized magnetically through AC and DC susceptibility measurements, and hysteresis loops as a function of field and temperature. While the near-pattern films were characterized in the in-plane configuration only, the nano-stripes were characterized in parallel, transverse and the perpendicular field configurations. The effects of the constrained geometry on the coercivity, exchange bias field, and the superparamagnetic blocking temperature were studied. It was determined that the coercivity, exchange bias field and the superparamagnet
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20

Jia-FangZhang and 張嘉芳. "Study on synthesis and magnetism of nano-hematite, nano-magnetite and nano-maghemite with different crystal morphologies." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/85525405426568850014.

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碩士<br>國立成功大學<br>地球科學系<br>102<br>The objective of this study is to investigate the magnetic properties of nano-hematite, nano-magnetite, and nano-maghemite with morphologies of nano-particle, nano-rod, nano-tube, and nano-ring. Four crystal morphologies of nano-hematite are synthesized by a hydrothermal method. Nano-magnetite is prepared via nano-hematite by using carbon reduction method. Nano-maghemite is obtained by oxidation of nano-magnetite. The particle-shaped nano-hematite has a granular morphology with aparticle size of 45~85 nm; the nano-rod is 50~100 nm in width and 250~350 nm in leng
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21

CHANG, CHEN LUN, and 張禎倫. "Preparation and charactenzation of magnetism nano particles with photo catalytic activity." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/92788377830809239181.

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碩士<br>萬能科技大學<br>材料科學與工程研究所<br>101<br>There are two works in our research. The first one is prepare Fe3O4 Nanoparticles with superparamagnetism by using precipitation method. The effects on the characteristics of NPs by changing prepared parameters are investigated. The second one is utilize sol gel method to prepare various Fe3O4-SiO2-TiO2 Nanoparticles (F.S.T. NPs). The F.S.T. NPs were encapsulated with high stability SiO2 and photo catalyst TiO2 respectively. The effects on the characteristics of F.S.T. NPs by changing prepared parameters are also investigated. The morphologies, sizes, const
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22

Chen, Yung-Sheng, and 陳永昇. "Microstructure and Magnetism Properties of Nano-sized Iron Oxide Contented Glass Ceramics." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/29123835623622470939.

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碩士<br>義守大學<br>材料科學與工程學系<br>92<br>The effect of iron oxide（Fe2O3）adding into the glass-ceramics, Li2O-Fe2O3-MnO2-CaO-P2O5-SiO2（LFMCPS）, on the crystalline phase transition, microstructures, the grain size of iron oxide phases, and magnetic properties were systematically studied in this thesis. The exothermic peak in DTA measurements for the bulk sample, is about 100℃ different from that for the powder sample illustrates that a surface nucleation process is undertaken in the LFMCPS glass ceramics system. In parallel, the X-ray diffraction pattern proves that the exothermic peak can be resulted f
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23

Weng, Yung-Jin, and 翁永進. "Development of Magnetism-assisted Micro-Imprinting Process for Replication of Nano/Micro-Structures." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/86095087077073228218.

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博士<br>國立臺灣大學<br>機械工程學研究所<br>97<br>Micro-nano structural components are the key components to be applied in future instrumentation for digital optoelectronics, telecommunications, flat panel displays, and bio-medicine. The conventional micro-component production technology requires a rigid mold of complicated manufacturing processes, expensive precision equipment, high temperature, and high pressure cooling processes. Therefore, the process has disadvantages, such as time-consuming, costly, and limited in visualization and controllability. This study aimed to develop a micro-nano structural
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24

Yi-PingYu and 尤奕馮. "Effects of raw materials on synthesis and magnetism of iron oxide nano-minerals." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/74905073993279529984.

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25

Chiou, Yen-Lin, and 邱彥霖. "Influence of oxygen on the interfacial magnetism of nano-scale Co/Ge (111) ultrathin films." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/31190376607612670298.

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碩士<br>東海大學<br>物理學系<br>93<br>The main purpose of this research is to study the influences of oxygen exposure on the magnetic properties of Co/Ge(111) ultrathin films in the ultra high vacuum (UHV), and this topic has been attacked using surface magneto-optic Kerr effect (SMOKE) technique for magnetic measurement and Auger electron spectroscopy (AES) for compositional analysis. No magnetic hysteresis loop on the polar configuration is found for Co/Ge(111) films with oxygen exposure. On the longitudinal configuration, the coercivity enhances drastically, but the remanence Kerr intensity reduces
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Kabiraj, Arnab. "High-Throughput Computational Techniques for Discovery of Application-Specific Two-Dimensional Materials." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5852.

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Two-dimensional (2D) materials have revolutionized the field of materials science since the successful exfoliation of graphene in 2004. Consequently, the advances in computational science have resulted in massive generic databases for 2D materials, where the structure and the basic properties are predicted using density functional theory (DFT). However, discovering material for a given application from these vast databases is a challenging feat. In this thesis, we have developed various automated high-throughput computational pipelines combining DFT and machine learning (ML) to assess the sui
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27

Kuila, Sourav. "Investigation of Magneto electric Effect in CoFe2O4-BiFeO3 Core-Shell Nano particles." Thesis, 2019. http://ethesis.nitrkl.ac.in/10015/1/2019_PhD_SKuila_513PH1004_Investigation.pdf.

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This thesis consists the details about the development of magnetoelectric voltage measurement set up and studies of various properties such as magnetic,magnetoelectric, magneto resistance and magneto impedance of CoFe2O4-BiFeO3 core-shell nanoparticles.A magnetoelectric(ME)voltage measurement set up has been developed following the dynamic method.This method is widely used as one can measure linear as well as quadratic magnetoelectric coefficients.In this setup,ME measurement can be performed by varying dc magneticfield(±1T)and temperature(120K400K).The calibration of this set up is executed
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