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Dissertations / Theses on the topic 'Magnonic'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 July 2024

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1

Sietsema, Glade Robert. "Properties and dynamics of spin waves in one and two dimensional magnonic crystals." Diss., University of Iowa, 2016. https://ir.uiowa.edu/etd/2141.

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Spintronics is a newly emerging field in physics, aimed at using the spin of electrons to carry information. One of the primary ways in which this could be done is through the use of spin waves. In order to do this, it will be necessary to have a complete understanding of spin waves and how they behave in various materials and structures. In this dissertation, we aim to create a thorough model of spin waves in both one-dimensional and two-dimensional magnonic crystals in an effort to understand and control their dispersion

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2

MALAGO', Perla. "Spin dynamics in two-dimensional magnonic crystals." Doctoral thesis, Università degli studi di Ferrara, 2016. http://hdl.handle.net/11392/2403466.

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Negli ultimi anni i sistemi magnetici di dimensioni nanometriche sono stati ampiamente studiati sia per le loro proprietà fondamentali che per le molte e potenti applicazioni tecnologiche in cui possono essere inseriti. Tra tutti i sistemi magnetici aventi dimensioni nanometriche, i cristalli magnonici sono quelli che mostrano proprietà molto interessanti poiché possiedono la caratteristiche di poter esser costruiti in una, due o tre dimensioni. Lo scopo di questa Tesi consiste nello studio delle proprietà fondamentali della magnetizzazione in cristalli magnonici mono e multi-materiale. L’anal

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3

Davison, Toby Charles. "Time-resolved imaging of magnetisation dynamics in nanoscale magnonic structures." Thesis, University of Exeter, 2012. http://hdl.handle.net/10036/3675.

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In this thesis the results of several different experimental techniques are presented. Time-resolved scanning Kerr microscopy and time-resolved optically pumped scanning optical microscopy measurements were made in Exeter on bi-component anti-dot lattices and permalloy films respectively. Magnetic transmission x-ray microscopy measurements were performed on cobalt nanostructures at the Advanced Light Source at the Lawrence Berkeley National Laboratory in Berkeley, California, USA. Time-resolved Kerr microscopy was used to study bi-component 400nm anti-dot lattices with a 1μm lattice constant.

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4

Adolff, Christian F. [Verfasser]. "Self-organized state formation in magnonic vortex crystals / Christian F. Adolff." München : Verlag Dr. Hut, 2016. http://d-nb.info/1100968423/34.

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5

Davies, Carl Simon. "Exciting and steering propagating spin waves using a graded magnonic index." Thesis, University of Exeter, 2016. http://hdl.handle.net/10871/25154.

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In this thesis, the results of time-resolved magneto-optical imaging experiments, micromagnetic simulations and analytical theory will be presented. These three approaches were used in order to understand how spin waves can be both excited and steered using magnetic non-uniformities (which gives rise to the graded magnonic index). The results presented in this thesis, as a whole, reveal that the graded magnonic index not only can be exploited either to excite or steer propagating spin waves in a deliberate manner, but is in fact a ubiquitous feature that needs to be taken into account when con

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6

Pfirrmann, Marco [Verfasser]. "Adding nonlinearity to an electromagnetic-magnonic quantum hybrid device / Marco Pfirrmann." Karlsruhe : KIT Scientific Publishing, 2020. http://d-nb.info/1216997306/34.

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7

Soumah, Lucile. "Pulsed Laser Deposition of Substituted thin Garnet Films for Magnonic Applications." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS042/document.

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Ce travail de doctorat porte sur la croissance par ablation laser pulsée de films ultrafins de Grenat de Fer et d’Yttrium dopés au Bismuth (BiYIG). Ces films d’épaisseur nanométriques sont caractérisés puis utilisés pour des applications magnon-spintroniques. Cette thèse englobe deux thématiques différentes de la physique : la science des matériaux et les applications magnon-spintroniques.La motivation de cette thèse repose sur le besoin, venant de la communauté magnon-spintronique, d’un nouveau matériau magnétique ultrafin à anisotropie ajustable. En effet, au court des dernières années, une

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8

Dvornik, Mykola. "Numerical investigations of spin waves at the nanoscale." Thesis, University of Exeter, 2011. http://hdl.handle.net/10036/3304.

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This thesis contains results of numerical investigations of magnetisation dynamics in nanostructed ferromagnetic materials. Magnetic systems have been simulated using the open source micromagnetic solver: Object Oriented Micromagnetic Framework (OOMMF), and thoroughly analysed using my own software: semargl. A systematic study of collective magnonic modes confined in 2D and 3D systems of rectangular ferromagnetic nano-elements is presented. The collective character of the excitations results from the dynamic magnetic dipole field. The magnetization dynamics of isolated rectangular elements is

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9

Langer, Manuel. "Spin Waves: The Transition from a Thin Film to a Full Magnonic Crystal." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-229338.

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The present work addresses in-depth magnetic films with magnonic surface patterning of variable size. Two different kinds of such structures referred to as surface-modulated magnonic crystals were investigated: Ion-irradiated magnonic crystals and structurally etched magnonic crystals. To achieve that, two different experimental approaches were pursued. On the one hand, the magnetic moment at the surface of lithographically patterned permalloy (Ni80Fe20) films was periodically reduced by means of ion irradiation. On the other hand, structural trenches were introduced at the surface of a pre-pa

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10

Adolff, Christian Frédéric [Verfasser], and Guido [Akademischer Betreuer] Meier. "Self-organized state formation in magnonic vortex crystals / Christian Frédéric Adolff. Betreuer: Guido Meier." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2016. http://d-nb.info/1099595061/34.

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11

Pfirrmann, Marco [Verfasser], and M. [Akademischer Betreuer] Weides. "Adding nonlinearity to an electromagnetic-magnonic quantum hybrid device / Marco Pfirrmann ; Betreuer: M. Weides." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/1201414881/34.

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12

Adolff, Christian Frédéric Verfasser], and Guido [Akademischer Betreuer] [Meier. "Self-organized state formation in magnonic vortex crystals / Christian Frédéric Adolff. Betreuer: Guido Meier." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2016. http://d-nb.info/1099595061/34.

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13

Cramer, Joel [Verfasser]. "Propagation, manipulation and detection of magnonic spin currents in magnetic oxides and metals / Joel Cramer." Mainz : Universitätsbibliothek Mainz, 2018. http://d-nb.info/1173005986/34.

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14

Costa, Carlos Humberto Oliveira. "Ondas de spin em quasi-cristais magn?nicos." Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/16625.

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Made available in DSpace on 2014-12-17T15:15:00Z (GMT). No. of bitstreams: 1 CarlosHOC_TESE.pdf: 15589268 bytes, checksum: 5a0a25bd59fcc76f4d53ba73163991d0 (MD5) Previous issue date: 2013-12-12<br>Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico<br>In this paper we investigate the spectra of band structures and transmittance in magnonic quasicrystals that exhibit the so-called deterministic disorders, specifically, magnetic multilayer systems, which are built obeying to the generalized Fibonacci (only golden mean (GM), silver mean (SM), bronze mean (BM), copper mean (CM) an

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15

Khanal, Shankar. "Study of Static and Dynamic Properties of Magnetic Nanostructures." ScholarWorks@UNO, 2017. http://scholarworks.uno.edu/td/2382.

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Magnetic materials are one of the most interesting and promising class of materials for technological applications [1]. Among them, patterned ferromagnetic systems have an important role especially in the prospect of high density data storage [2], domain wall logic devices [3] and magnetic memory [4, 5]. Coupled systems of ferromagnetic and antiferromagnetic materials have been implemented to design sensors such as giant magnetoresistance (GMR) [6-8] and tunnel magnetoresistance (TMR) [9, 10]. Ferromagnetic nanoparticles have been used for the drug targeting, cancer therapy, MRI and many more

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16

Neusser, Sebastian Verfasser], Dirk [Akademischer Betreuer] Grundler, and Rudolf [Akademischer Betreuer] [Gross. "Spin Waves in Antidot Lattices : From Quantization to Magnonic Crystals / Sebastian Neusser. Gutachter: Dirk Grundler ; Rudolf Gross. Betreuer: Dirk Grundler." München : Universitätsbibliothek der TU München, 2011. http://d-nb.info/1012187101/34.

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17

Langer, Manuel [Verfasser], Jürgen [Akademischer Betreuer] Fassbender, and Pedro [Gutachter] Landeros. "Spin Waves: The Transition from a Thin Film to a Full Magnonic Crystal / Manuel Langer ; Gutachter: Pedro Landeros ; Betreuer: Jürgen Fassbender." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://d-nb.info/1142736261/34.

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18

Schwarze, Thomas [Verfasser], Dirk [Akademischer Betreuer] Grundler, and Christian [Akademischer Betreuer] Pfleiderer. "Spin Waves in 2D and 3D Magnonic Crystals: From Nanostructured Ferromagnetic Materials to Chiral Helimagnets / Thomas Schwarze. Gutachter: Dirk Grundler ; Christian Pfleiderer. Betreuer: Dirk Grundler." München : Universitätsbibliothek der TU München, 2013. http://d-nb.info/1046176013/34.

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19

Karenowska, Alexy Davison. "Some magnetic reflections on wave dynamics." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:d31bd222-a948-45f8-9617-40507f4f96c6.

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20

Heimbach, Florian [Verfasser], Dirk [Akademischer Betreuer] [Gutachter] Grundler, and Martin S. [Gutachter] Brandt. "Current-Controlled Spin-Wave Interference in Magnonic Waveguides and Magnetization Dynamics in Artificial Spin Ice and Ferromagnetic Nanotubes / Florian Heimbach. Betreuer: Dirk Grundler. Gutachter: Dirk Grundler ; Martin S. Brandt." München : Universitätsbibliothek der TU München, 2016. http://d-nb.info/1103658298/34.

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21

Jamison, John S. "Time and Space Resolved Spin-Heat Transport in the Magnetic Insulator Yttrium Iron Garnet." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1586740671277489.

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22

Brandl, Florian [Verfasser], Dirk [Akademischer Betreuer] Grundler, and Martin S. [Akademischer Betreuer] Brandt. "Thermal effects in laser-heated freestanding permalloy and multiferroic hybrid structures forming magnonic grating couplers and prototype spin wave multiplexers / Florian Brandl. Gutachter: Dirk Grundler ; Martin S. Brandt. Betreuer: Dirk Grundler." München : Universitätsbibliothek der TU München, 2014. http://d-nb.info/1070624225/34.

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23

Mikhaylovskiy, Rostislav. "Terahertz magnonics." Thesis, University of Exeter, 2012. http://hdl.handle.net/10871/9803.

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The potential of terahertz time domain spectroscopy has until recently been neglected in the field of the ultrafast magnetism. At the same time this technique can serve as a useful complementary tool with respect with conventional methods to investigate ultrafast magnetization dynamics. This thesis aims to implement time domain terahertz spectroscopy to observe high frequency spin waves excited optically in different magnetic systems. This work covers several distinct phenomena related to the study of spin waves (magnonics) at terahertz frequencies. The generation of transient broadband nonlin

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24

Fung, Tsz Cheong. "Phonon magnonics." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:a36d494d-73c5-410a-82df-abd0117884e6.

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This thesis reports on some recent results in the field of acoustics and magnonics. Chapter 1 reviews the literature on magnonics and GHz frequency transducers, and highlights the lack of understanding of the growth mechanism of magnetron sputtered ZnO thin films. A novel configuration for exciting magnetostatic spinwaves using ZnO transducers is proposed. Chapter 2 is an introduction to piezoelectricity and how it can be used to generate GHz acoustic waves. A detailed formulation of the Mason model is presented in chapter 3 for predicting the performance of ZnO transducers. In chapter 4, the

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25

Huber, Rupert Verfasser], Dirk [Akademischer Betreuer] Grundler, and Paolo [Akademischer Betreuer] [Lugli. "Control of Spin Waves on the Nanoscale in One-Dimensional Magnonic Crystals and Atomic Layer Deposition of Metallic Ferromagnets for Second Generation of Nanomaterials / Rupert Huber. Gutachter: Dirk Grundler ; Paolo Lugli. Betreuer: Dirk Grundler." München : Universitätsbibliothek der TU München, 2013. http://d-nb.info/1047185474/34.

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26

Morris, Richard. "Studies towards quantum magnonics." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:89784b64-de31-457f-b9b2-54125c862632.

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This thesis reports on recent results which pave the way for future experiments in the emerging field of quantum magnonics. Chapter 1 presents a brief outline of the field of magnonics, which provides the context in which quantum magnonics has begun to develop. Chapter 2 provides an introduction to the theory of spin waves, which is necessary to understand the experiments reported in the thesis. In Chapter 3, the experimental methods and materials used to carry out the investigations in the thesis are described. Chapter 4 describes the coupling of resonant magnon modes in a sphere of yttrium-i

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27

Flajšman, Lukáš. "Studium dynamických vlastností magnetických nanostruktur a nanostrukturovaných metamateriálů pomocí magneto-optických metod." Doctoral thesis, Vysoké učení technické v Brně. CEITEC VUT, 2020. http://www.nusl.cz/ntk/nusl-414192.

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Magnonika je novým odvětvím výzkumu, který se zabývá fyzikou spinových vln. Magnonika jako vědní obor nabízí nové možnosti například v nediskrétních výpočtech na základě vlnového charakteru spinových vln. Při výrobě magnonických prvků klasickými metodami není možné příliš měnit charakter materiálů, ze kterých jsou jednotlivé prvky vyrobeny. Tento fakt silně omezuje univerzálnost vyrobených struktur. Cílem této práce je aplikovat nový typ materiálu do oboru magnoniky. Specifikum daného materiálu je možnost zápisu magnetických struktur pomocí iontového svazku. Ukazuje se, že tyto struktury mají

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28

Carlyle, Erin. "Magnolia Canopy Otherworld." Bowling Green State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1555331993434814.

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29

Henderson, Ryan Lynn. "Magnolia Star Route." Master's thesis, Mississippi State : Mississippi State University, 2007. http://library.msstate.edu/etd/show.asp?etd=etd-04092007-130126.

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30

Wojewoda, Ondřej. "Měření fáze spinových vln pomocí Brillouinova rozptylu světla: vývoj zařízení a jeho aplikace." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417148.

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Spinové vlny mají potenciál být použity jako nová platforma pro přenos a zpracování dat, protože mohou dosáhnout vlnových délek v rozsahu nanometrů a frekvencí v rozsahu terahertzů. K tomu, aby bylo možné navrhnout zařízení a logické obvody založené na spinových vlnách, je zapotřebí získat informace o prostorovém rozložení intenzity spinové vlny a pokud je to možné, také o jejich fázi. To lze měřit pomocí fázově rozlišeného fokuso-vaného Brillouinova rozptylu světla (µ -BLS). Předložená práce se zabývá rozšířením stávající optické sestavy o možnost měření fáze, kde doposud bylo možné měřit pou

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31

Lewis, Joshua Harlan. "The silk magnolia [poems] /." Diss., Online access via UMI:, 2006.

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32

Franson, Andrew J. "Patterning and Characterization of Ferrimagnets for Coherent Magnonics." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1595333967161284.

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33

Clot, Eric. "Mise au point d’un microscope à centre azote-lacune dans un électro-aimant." Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALY015.

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La compréhension fine de la dynamique magnétique dans les nano-objets revêt un intérêt stratégique pour les technologies de l’information. Les caractéristiques recherchées sont les propriétés spectroscopiques des modes propres, leurs profils de précession, les effets non-linéaires et la compréhension fondamentale des processus de relaxation.Bien qu’il existe une large panoplie d’outils capables de mesurer le profil spatio-temporelle des ondes de spin, aucun actuellement ne peut le faire sans sacrifier un paramètre que ce soit dans la gamme de fréquence, la gamme de champ, la résolution spatial

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Chilcote, Michael A. "Controlling Anisotropy in Organic-Based Magnets for Coherent Magnonics." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1546565729485741.

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35

Prater, Holger Michelle Ann, and Michael Andrew Prater. "Magnolia Bakery & Coffee Shop." Tesis, Universidad de Chile, 2017. http://repositorio.uchile.cl/handle/2250/147748.

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TESIS PARA OPTAR AL GRADO DE MAGÍSTER EN ADMINISTRACIÓN<br>Michelle Ann Prater Holger [Parte I], Michael Andrew Prater [Parte II]<br>Este plan de negocios evalúa la introducción al mercado de “Magnolia Bakery & Coffee Shop”, una cafetería gourmet que buscará generar una experiencia de consumo diferenciada con una oferta de productos distinta al mercado actual santiaguino. En términos de modelo de negocio, Magnolia ha definido un modelo que brindará flexibilidad y agilidad en la adaptación al entorno. Su mercado objetivo es el segmento ABC1 C2 del sector oriente y considera la apertura de

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Turčan, Igor. "Studie magnonických krystalů ve frekvenční doméně." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-319483.

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Popis magnetodynamických vlastností nanomagnetů a nanostrukturovaných magnetických materiálů vyžaduje metody vhodné pro zkoumání typické časové odezvy těchto systémů, tj. v řádu nanosekund a méně. Nedostatek technik, vhodných právě pro charakterizaci v časové doméně, je spojen s možnostmi současné elektroniky. Další možný přístup, jak popsat vlastnosti nanomagnetů, je charakterizace ve frekvenční doméně v pásmu GHz. Nejrozšířenější technikou charakterizace ve frekvenční doméně je měření feromagnetické rezonance (FMR). Ze spekter FMR lze získat cenné informace o systému: parametr tlumení, satur

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Persson, Jacob. "Magnon-Phonon Coupling." Thesis, Uppsala universitet, Materialteori, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-377297.

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Recent experimental and theoretical studies have found evidence of coupled interactions between magnons and phonons. The aim of this study is to construct a model of coupled magnons and phonons, as well as analysing their frequency spectrum. The model is derived by quantizing spin and lattice degrees of freedom, and the frequency spectrum is derived by solving the equations of motion. We found that both the strength and the composition of the coupled interactions affect the frequencies of magnons and phonons, with emphasis on the magnons. Their frequencies are imaginary close to the center of

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Mook, Alexander [Verfasser]. "Topological magnon materials and transverse magnon transport : [kumulative Dissertation] / Alexander Mook." Halle, 2017. http://d-nb.info/1142155307/34.

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Ciavarella, Andrew Michael. "Giant magnons and giant gravitons." Thesis, Durham University, 2011. http://etheses.dur.ac.uk/836/.

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In this thesis we shall present work concerning the description of the emergence of solitonic fundamental strings from stable, finite energy, compact D3-branes in a subspace of $AdS_{5}\times S^{5}$ and their subsequent interaction. We work in the planar limit and focus on states of large angular momentum $J$ corresponding to large R-charge in the dual gauge theory. We begin by constructing the full set of boundary giant magnons on $\mathbb{R}\times S^{2}$ attached to the maximal $Z=0$ giant graviton by mapping from the general solution to static sine-Gordon theory on the interval. We then com

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Elam, Kevin Patrick. "The Magnolia Warbler Dendroica magnolia on Unaka Mountain, Unicoi County, TN: Possible Breeding and Habitat Analysis." [Johnson City, Tenn. : East Tennessee State University], 2004. http://etd-submit.etsu.edu/etd/theses/available/etd-0602104-160956/unrestricted/ElamK062204f.pdf.

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Thesis (M.S.)--East Tennessee State University, 2004.<br>Title from electronic submission form. ETSU ETD database URN: etd-0602104-160956 Includes bibliographical references. Also available via Internet at the UMI web site.

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Plotke, Kathryn. "Somatic Embryogenesis of Magnolia spp. and Cultivars." Thesis, North Dakota State University, 2018. https://hdl.handle.net/10365/28740.

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This study focused on induction of somatic embryogenesis of Magnolia spp. and cultivars utilizing leaf and seed (immature and mature) tissues with attempted micropropagation experiments. In a preliminary experiment, direct embryo regeneration was successful in a single leaf tissue of M. ‘Yellow Bird’. After various micropropagation experiments, microshoot proliferation rates decreased. As a result of minimal leaf material, mature seeds were utilized but had contamination issues. Subsequent experiments utilized immature seeds. M. ‘Leonard Messel’ and M. stellata had significantly greater e

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Jarufe, Troncoso Claudio Felipe. "Magnones y plasmones en un film geométricamente modulado." Tesis, Universidad de Chile, 2012. http://www.repositorio.uchile.cl/handle/2250/114768.

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Magíster en Ciencias, Mención Física<br>En este trabajo se presenta la teoría para estudiar los modos de oscilación de plasmones y magnones en un lm geométricamente modulado y se analiza la respuesta de la polarización y magnetización, respectivamente, al aplicar un campo externo paralelo al eje de simetría de la perturbación. La geometría en cuestión corresponde a un lm delgado ferromagnético para el análisis de los magnones y dieléctrico en el caso de los plasmones. El lm posee una modulación periódica de sus superficies en una cierta dirección. El estudio se realizó suponiendo que la escal

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Rodríguez, Cortéz Carlos Alfonso. "Effect of thermal magnons onedge fluctuations innanomagnets." Thesis, Uppsala universitet, Materialfysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-451961.

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Vannucchi, Fabio Stucchi 1981. "Termodinâmica estatística de não-equilíbrio da condensação de Fröhlich-Bose-Einstein de mágnons excitados." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277142.

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Orientadores: Roberto Luzzi, Áurea Rosas Vasconcellos<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-10-31T13:25:44Z (GMT). No. of bitstreams: 1 Vannucchi_FabioStucchi_D.pdf: 4583166 bytes, checksum: 8617f375a632ae1e33b0c986862ea535 (MD5) Previous issue date: 2011<br>Resumo: Este trabalho tem por objetivo desenvolver uma teoria sobre a termodinâmica de não-equilíbrio de mágnons excitados por fonte externa e em contato com um banho térmico. A teoria é aplicada ao recém observado acúmulo de mágnons nos estados de m

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Палагеча, Р. М. "Структурно-функціональні особливості зимостійкості деяких видів роду Magnolia L". Дис. канд. біол. наук, КНУТШ, 2006.

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Hong, Ki Myung. "Exegesis and screenplay for a film entitled: White Magnolia." Click here to access this resource online, 2009. http://hdl.handle.net/10292/790.

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Most new migrants choose New Zealand as their second home country because New Zealand provides peaceful, safe and relaxed life style and also quality education compared to their homelands. However, for most migrants, settling down in New Zealand is one of the most dynamic and complex processes in their lives. Many migrants are struggling to adjust to New Zealand because the expression of cultural values is different in New Zealand than in their cultures. As migrants adjust to the new culture, their traditional cultural values are increasingly challenged by New Zealand cultural values leading t

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Garza, Gabriella A. "Twice Displaced: Katrina and the Redevelopment of the Magnolia." ScholarWorks@UNO, 2015. http://scholarworks.uno.edu/td/2075.

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Where and how to house the urban poor remains a controversial issue. Public housing residents are particularly vulnerable. Issues of race, class and gender intersect in their lives. Public-private partnerships in urban redevelopment projects and a focus on issues that arise from concentrated poverty gave rise to HOPE VI policy aimed at deconcentrating poverty via public housing demolition and redevelopment. In New Orleans, the effects of Hurricane Katrina further complicate this contested process. The purpose of this case study is to understand how residents experienced and framed the process

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Hickel, Tilmann. "Theory of many-body effects in the Kondo-lattice model." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2006. http://dx.doi.org/10.18452/15500.

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Das magnetische Verhalten zahlreicher Materialien lässt sich auf eine indirekte Wechselwirkung lokalisierter magnetischer Momente, vermittelt durch die Elektronen eines Leitungsbandes, zurückführen. Das Kondo-Gitter-Modell hat sich als elegante Möglichkeit bewährt, diesen Prozess quantenmechanisch zu beschreiben. Es reduziert die Physik auf eine intraatomare Wechselwirkung der Spins von lokalisierten und itineranten Elektronen. Die vorliegende Arbeit ist den analytischen Eigenschaften dieses Modells gewidmet. Die besondere Herausforderung des Kondo-Gitter-Modells besteht dabei im Zus

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António, Bruno Alexandre Zeverino. "Coherent magnon transport through magnetic nanoclusters." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/13761.

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Mestrado em Física<br>The main goal of this thesis is to study the transmittance of single magnons through magnetic nanoclusters. Our approach relies on the Matsubara-Matsuda transformation, which maps a magnonic circuit of a magnetic cluster connected to 1D leads into a hard-core boson system. The transmittance of non-interacting magnons is computed by solving a system of Nc +2 coupled Schrödinger equations (where Nc is the number of sites of the cluster). In the case of interacting magnons an approximate method was followed which relies in a similar tunnelling perspective. We address the e e

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Pantaleon, Peralta Pierre Anthony. "A theoretical investigation of 2D topological magnets." Thesis, University of Manchester, 2019. https://www.research.manchester.ac.uk/portal/en/theses/a-theoretical-investigation-of-2d-topological-magnets(1a330443-752a-4a41-b866-72f7a98c97a5).html.

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Since the discovery of the long-range ferromagnetic order in two-dimensional and multi-layered van der Waals crystals, and the observation of a nontrivial topology of the magnon bulk bands in the chromium trihalides, the bosonic honeycomb lattices have drawn significant attention within the condensed matter community. In this thesis, we employ a Heisenberg model with a Dzyaloshinsky-Moriya interaction in a honeycomb ferromagnetic lattice to study the properties of bulk and edge spin-wave excitations (magnon). By the Holstein-Primakoff transformations in the linear spin-wave approximation, the

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