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Dissertations / Theses on the topic 'Ultrathin magnetic films'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

Vaz, Carlos Antonio Fernandes. "Interface anisotropies in ultrathin magnetic films." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620969.

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2

Porrati, Fabrizio. "Spatially varying magnetic anisotropies in ultrathin films." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=967319277.

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3

Tselepi, Marina. "Atomic scale structure in ultrathin magnetic films." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624211.

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4

Cowburn, R. P. "Magnetic switching and domain structure in ultrathin epitaxial magnetic films." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598084.

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A detailed experimental study using magnetooptics has been performed into magnetic switching and domain structure predominantly in high quality ultrathin epitaxial Ag/Fe/Ag(001) films, for both in-plane and out of plane magnetisation. When the magnetisation is in-plane, magnetic switching has been found to proceed by a series of irreversible jumps of the magnetisation direction, each of which is mediated by the sweeping of domain walls. A simple phenomenological model has been developed which explains the switching and which highlights the role of magnetic anistropy and domain wall pinning by

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5

Hope, S. "Spin polarised radiation studies of ultrathin magnetic films." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604219.

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Two distinct spin polarised radiation techniques have been employed to determine the magnetic properties of ultrathin magnetic films in-situ and ex-situ. The magneto-optical Kerr effect has been used to study the evolution of the magnetic properties during room temperature growth of Co/Cu(110) in -situ. The thickness dependence of the magnetic moment per atom in the Cu/Ni/Cu/Si(001) system has been investigated ex-situ using polarised neutron reflection. The Co/Cu(110) system is found to exhibit a 3D growth mode, becoming ferromagnetic at a critical thickness of d<SUB>c</SUB>=4.6±1.1. ML. Rema

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6

Freeland, D. J. "Role of morphology in ultrathin magnetic Fe films." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599205.

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Single crystal ultrathin Fe films have been grown on Ag(100), GaAs(100) and InAs(100) substrates, using MBE. As magnetic properties are highly dependent on the interface and morphology of surfaces, characterisation have been performed <I>in-situ</I>, to establish the correlation between magnetism and morphology. Epitaxial Fe has been deposited on GaAs(100)-4x6 at room temperature and the evolution of the phase transition from superparamagnetic to ferromagnetic has been studied. MOKE measurements indicate that after the onset of ferromagnetism, the <I>whole </I>Fe film is ferromagnetic and ther

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7

Lew, Wen Siang. "Spin configurations and switching in ultrathin magnetic films." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620424.

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8

Guan, Wei. "Ultrathin films on semiconductor substrates: growth, magneto-optical characteristics and spin injection." Thesis, University of Salford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490413.

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Ferromagnetic metal films on semiconductors are considered to be one of the most likely candidates to achieve an efficient spin injection at room temperature, which is one of the essential requirements for spintronics devices. The work presented focused on a study of the ferromagnetic film-semiconductor heterostructures, especially their magneto-optical properties and spin injection.

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9

Di, Nan. "Electric and chemical manipulation of magnetic anisotropy of ultrathin ferromagnetic films." Palaiseau, Ecole polytechnique, 2015. https://theses.hal.science/tel-01224224/document.

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10

Song, Jiaming [Verfasser]. "Structural, electronic and magnetic properties of ultrathin epitaxial manganese films / Jiaming Song." Berlin : Freie Universität Berlin, 2015. http://d-nb.info/1077768214/34.

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11

Heide, Marcus. "Magnetic domain walls in ultrathin films contribution of the Dzyaloshinsky-Moriya interaction /." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=981517242.

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12

Skinta, John A. "Magnetic penetration depth studies of electron-doped cuprate and ultrathin YBCO films /." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486459267521535.

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13

Wang, N. Y. N. "Optical spin injection and XMCD in ultrathin magnetic films deposited on GaAs." Thesis, University of Salford, 2009. http://usir.salford.ac.uk/26959/.

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The primary aim of this work is to study optically excited spin injection over a ferromagnetic metal-semiconductor Schottky barrier. A novel experimental approach has been introduced which enables the determination of the sign in the magnetic asymmetry of the photocurrent, hence the sign in the spin polarisation. The magnetic ultrathin films are grown on GaAs substrates using an e-beam evaporation technique in an ultrahigh vacuum system. The elemental and chemical characterisation of the Fe/GaAs samples has been conducted using x-ray absorption spectroscopy (XAS) whilst x-ray magnetic circular

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14

Nallan, Himamshu, Thong Ngo, Agham Posadas, Alexander Demkov, and John Ekerdt. "Area Selective Deposition of Ultrathin Magnetic Cobalt Films via Atomic Layer Deposition." Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-207142.

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The work investigates the selective deposition of cobalt oxide via atomic layer deposition. Methoxysilanes chlorosilane and poly(trimethylsilylstyrene) self-assembled monolayers are utilized to prevent wetting of water and cobalt bis(N-tert butyl, N'-ethylpropionamidinate) from the substrate, thereby controlling nucleation on the substrate and providing a pathway to enable selective deposition of cobalt oxide. Sr and Al are deposited atop the oxide films to scavenge oxygen and yield carbon-free cobalt metal films. Thermal reduction of the oxide layer in the presence of CO and H 2 was also inve

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15

Rovinelli, Giovanni. "Magnetic, morphological and structural properties of polycrystalline ultrathin cobalt films for organic spintronics." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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The opportunity of using the organic molecules in spintronic devices appeared challenging since these materials, having nominally high spin relaxation times, are suitable for coherent spin manipulation. The spin behaviour in these molecular spintronic devices has been demonstrated to strongly depend on the nature of the chemical bonds between the organic molecules and the magnetic electrodes affecting also the magnetic response of both molecular and metallic sides. In particular, the adsorption of an organic molecule on a ferromagnetic layer has been proved to change the local magnetism of a m

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16

Liu, Yanwei. "A study of magnetic ultrathin films on GaAs and optically excited spin injection." Thesis, University of Salford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490537.

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Ferromagnetic metal - semiconductor Schottky diode structures are believed to be one of the most likely candidates to achieve an efficient spin injection at room temperature, which is one of the essential requirements for spintronic devices. rhe work presented has been performed with the aim of achieving a comprehensive understanding of the complicated spin-dependent transport processes taking place in the ferromagnetic metal-semiconductor Schottky diode structures.

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17

Chuang, Donna Sue. "Magnetic anisotrophy in ultrathin epitaxial films grown on surfaces vicinal to Cu(001)." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/32145.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1994.<br>Vita.<br>Includes bibliographical references (leaves 115-119).<br>by Donna Sue Chuang.<br>Ph.D.

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18

McManus, Moyra Kathleen. "X-ray absorption fine structure measurements of the lattice strain in magnetic ultrathin films." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq24332.pdf.

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19

Butterfield, Martin Thomas. "Surface structure of ultrathin metal films deposited on copper single crystals." Thesis, Loughborough University, 2000. https://dspace.lboro.ac.uk/2134/33132.

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Ultrathin films of Cobalt, Iron and Manganese have been thennally evaporated onto an fcc Copper (111) single crystal substrate and investigated using a variety of surface structural teclmiques. The small lattice mismatch between these metals and the Cu (111) substrate make them an ideal candidate for the study of the phenomena of pseudomorphic film growth. This is important for the understanding of the close relationship between film structure and magnetic properties. Growing films with the structure of their substrate rather than their bulk phase may provide an opportunity to grow materials w

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20

Pietzsch, Oswald. "Magnetic imaging by spin-polarized scanning tunneling spectroscopy applied to ultrathin Fe/W(110) films." [S.l.] : [s.n.], 2001. http://www.sub.uni-hamburg.de/disse/444/Disse.pdf.

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21

Romming, Niklas [Verfasser], and Roland [Akademischer Betreuer] Wiesendanger. "Discovery and Manipulation of Individual Skyrmions in Ultrathin Magnetic Films / Niklas Romming ; Betreuer: Roland Wiesendanger." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2018. http://d-nb.info/1150401516/34.

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22

Johnston, Hamish. "A study of the magnetic and structural properties of ultrathin Fe/Ni(111/W(110) films /." *McMaster only, 1997.

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23

Johnston, Hamish L. "A study of the magnetic and structural properties of ultrathin Fe/Ni(111)/W(110) films." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ30149.pdf.

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24

Perini, Marco [Verfasser], and Roland [Akademischer Betreuer] Wiesendanger. "Nanoscale non-collinear magnetic structures in Co-based epitaxial ultrathin films / Marco Perini ; Betreuer: Roland Wiesendanger." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2019. http://d-nb.info/117936273X/34.

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25

Ott, Holger. "Magnetic structures and phase transitions in thin and ultrathin films of heavy lanthanide metals investigated by resonant magnetic X-ray scattering." [S.l. : s.n.], 2004. http://www.diss.fu-berlin.de/2004/186/index.html.

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26

Ramchal, Robert. "In situ magnetic domain imaging at the spin-reorientation transition of ultrathin Ni- and Fe/Ni-films." [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=973910720.

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27

Ramchal, Robert Rabindranath. "In situ magnetic domain imaging at the spin-reorientation transition of ultrathin Ni- and Fe/Ni-films." Gerhard-Mercator-Universitaet Duisburg, 2005. http://www.ub.uni-duisburg.de/ETD-db/theses/available/duett-01312005-175427/.

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In order to characterize the spin-reorientation transition (SRT), i. e. the change of the easy axis of the magnetization, of ultrathin Ni/Cu(100)- and Fe/Ni/Cu(100)-films the magnetic domain structure was imaged as a function of the Ni and Fe layer thickness, respectively, by using spin-polarized low energy electron microscopy (SPLEEM) during the film growth in ultrahigh vacuum at 300 K. Whereas the size of the domains at the SRT of Ni/Cu(100) is some micrometers, the domain structure of the Fe/Ni-films breaks up into a pattern of 180 nm wide stripe domains. It was shown that the SRT of both N

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28

Kuhrau, Susanne [Verfasser], and Hans Peter [Akademischer Betreuer] Oepen. "Surface-sensitive magnetic imaging of polycrystalline and epitaxial ultrathin cobalt films with a perpendicular magnetic anisotropy / Susanne Kuhrau ; Betreuer: Hans Peter Oepen." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2019. http://d-nb.info/1197801227/34.

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29

Mann, Olivier Patrice. "Nanoscale electrodeposition of ultrathin magnetic Ni films and of the compound semiconductors AlSb and ZnSb from ionic liquids." Göttingen Cuvillier, 2007. http://d-nb.info/98745594X/04.

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30

Mann, Olivier Patrice. "Nanoscale electrodeposition of ultrathin magnetic Ni films and of the compound semiconductors AlSb and ZnSb from ionic liquids /." Göttingen : Cuvillier, 2008. http://d-nb.info/98745594X/04.

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31

von, Malottki Stephan [Verfasser], Stefan [Akademischer Betreuer] Heinze, Fabio [Gutachter] Caruso, and Hannes [Gutachter] Jónsson. "Stability of magnetic skyrmions in ultrathin films / Stephan von Malottki ; Gutachter: Fabio Caruso, Hannes Jónsson ; Betreuer: Stefan Heinze." Kiel : Universitätsbibliothek Kiel, 2020. http://d-nb.info/123127588X/34.

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32

Hagemeister, Julian Claudius [Verfasser], and Roland [Akademischer Betreuer] Wiesendanger. "Confinement effects and stability of spin-spirals and skyrmions in ultrathin magnetic films / Julian Claudius Hagemeister ; Betreuer: Roland Wiesendanger." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2017. http://d-nb.info/1139493078/34.

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33

Govind, Remya Kunjuveettil [Verfasser], Karl-Michael [Akademischer Betreuer] Schindler, Kathrin [Akademischer Betreuer] Dörr, and Clemens [Akademischer Betreuer] Laubschat. "Growth, magnetic properties and interface effects of Fe and Fe-oxide ultrathin films on BaTiO3(001) substrates / Remya Kunjuveettil Govind. Betreuer: Karl-Michael Schindler ; Kathrin Dörr ; Clemens Laubschat." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2013. http://d-nb.info/1045604151/34.

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34

Gray, S. J. "Structure and magnetism in ultrathin iron films." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599627.

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Fe films have been grown epitaxially on Ag(001) and GaAs(001) substrates. Ultra high vacuum conditions were used to allow the evolution of structural and magnetic properties to be studied during film growth. Structural characterisation was by LEED and RHEED and in situ magnetic characterisation by longitudinal MOKE and BLS. These techniques were further used to study the effect of Ag and Cr overlayers on 6 and 14 <SUB>ML</SUB> Fe films. Some films were capped and further characterised ex situ by longitudinal and polar MOKE, and Kerr spectroscopy. Fe films deposited on Ag(001) were found to cov

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35

Schumann, Frank Oliver. "2D magnetism of ultrathin Co/Cu(100) films." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337385.

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36

Tetienne, Jean-Philippe. "Un microscope de champ magnétique basé sur le défaut azote-lacune du diamant : réalisation et application à l'étude de couches ferromagnétiques ultraminces." Thesis, Cachan, Ecole normale supérieure, 2014. http://www.theses.fr/2014DENS0037/document.

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La capacité à cartographier le champ magnétique à l'échelle nanométrique serait un atout crucial pour étudier les propriétés magnétiques des solides ainsi que certains phénomènes de transport, mais aussi pour des études fondamentales en biologie. Cette thèse porte sur la réalisation d'un microscope de champ magnétique d'un genre nouveau, qui promet une résolution spatiale de quelques nanomètres, une sensibilité de l'ordre du nanotesla, et fonctionne aux conditions ambiantes. Ce microscope est basé sur le défaut azote-lacune du diamant, dont les propriétés quantiques peuvent être exploitées pou

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37

Küpper, David. "Gas adsorption effects on magnetism and structure of ultrathin Co-based films." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612263.

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38

Finco, Aurore [Verfasser], and Roland [Akademischer Betreuer] Wiesendanger. "Interplay between non-collinear magnetism and nanoscale structural properties in epitaxial Fe-based ultrathin films / Aurore Finco ; Betreuer: Roland Wiesendanger." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2018. http://d-nb.info/116301365X/34.

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39

Klimenta, Florian [Verfasser], H. L. [Akademischer Betreuer] Meyerheim, W. [Akademischer Betreuer] Hergert, and N. [Akademischer Betreuer] Jedrecy. "Preparation, geometric structure and magnetism of ultrathin oxide films on metal surfaces / Florian Klimenta. Betreuer: H. L. Meyerheim ; W. Hergert ; N. Jedrecy." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2013. http://d-nb.info/1036872424/34.

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40

Fruchart, Olivier. "Elaboration, étude et modélisation d'un système magnétique modèle : réseaux de plots sub-microniques ultraminces de Fe(110) épitaxié à anisotropie planaire." Université Joseph Fourier (Grenoble ; 1971-2015), 1998. http://www.theses.fr/1998GRE10094.

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L'objectif de cette these etait l'elaboration, l'etude et la modelisation des processus de renversement de l'aimantation dans un systeme modele : des plots submicroniques ultraminces epitaxies a aimantation planaire. Nous avons montre en depot laser pulse (dlp) par analyse rheed et afm que le procede habituel de depot a t<800c des couches tampons de w et mo sur al#2o#3 induisait une rugosite importante. Nous proposons un nouveau procede fonde sur un depot a 200c, un recuit a 800c et une poursuite de depot a 800c, qui permet l'obtention de couches monocristallines de mo(110) dont la surface est

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41

Makarov, Sergey [Verfasser], and Heiko [Akademischer Betreuer] Wende. "Magnetism of ultrathin Fe(001) films on Ir(001) inferred from in-situ 57Fe conversion electron Mössbauer spectroscopy in ultrahigh vacuum / Sergey Makarov. Betreuer: Heiko Wende." Duisburg, 2016. http://d-nb.info/1098130472/34.

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42

Lee, Kuo-Long, and 李國隆. "Magnetic Domains of NiO/Ni/Cu(001) Ultrathin Films." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/94779665096512271868.

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碩士<br>國立中正大學<br>物理系<br>99<br>The magnetic properties of a film of NiO/Ni/Cu(001) were investigated by using Magneto-Optical Kerr Effect (MOKE) , Photoemission Electron Microscopy (PEEM) at different temperature. The film was deposited by thermal evaporation of 13 ML Ni on Cu(001) substrate in an ultrahigh vacuum (UHV) chamber with a base pressure of 5×10-10 mbar and followed by oxygen exposure for 1800 Langmuir (L) . The growth of the film was monitored by using Medium-Energy Electron Diffraction (MEED) . The structure was resolved by using Low Energy Electron Diffraction (LEED) and IV-LEED. T

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43

Chang, Y. C., and 張硯筑. "Study surface magnetic-optic properties of ultrathin films on dilute magnetic semiconductor." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/4a838j.

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碩士<br>國立嘉義大學<br>光電暨固態電子研究所<br>97<br>The magneto-optic properties of ultrathin films were studied by the surface magneto-optic effect in ultrahigh vacuum (UHV). It is one of main systems in our laboratory. There are two kinds of magneto-optic system: Faraday effect and Kerr effect. Generally, the surface magneto-optical Faraday effect (SMOFE) is used to measures the transparent substrate. Unlike the Kerr effect is used to measure the reflection signals. This thesis presents the details of the measurement and theory of Faraday effect, and the problems solved by the tool about ultrathin films on

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44

Porrati, Fabrizio [Verfasser]. "Spatially varying magnetic anisotropies in ultrathin films / von Fabrizio Porrati." 2002. http://d-nb.info/967319277/34.

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45

Huang, Shin-Hsueh, and 黃士學. "Characteristics of ultrathin CoFeB thin films with perpendicular magnetic anisotropy." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/71170250642387891439.

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碩士<br>國立雲林科技大學<br>材料科技研究所<br>99<br>In this study, we focused on the ultrathin CoFeB films with perpendicular magnetic anisotropy (PMA) which can be used for perpendicular magnetic tunnel junctions (pMTJs). The magnetic properties of the films were tuned by varying the CoFeB composition and the annealing temperatures. Two different compositions of CoFeB were studied: Co40Fe40B20 and Co20Fe60B20. At the first stage of the experiment, we fabricated both the bottom substructure Ta / CoFeB / MgO and the top structure MgO / CoFeB / Ta of pMTJs to look for conditions of PMA. The magnetic properties o

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46

阮家治. "Investigation of magnetic for Co ultrathin films on Fe/Pt(111)." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/33777072912265349614.

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47

Chiu, Chih-Lang, and 邱志郎. "Influence of Growth Temperature on Magnetic Properties in Magnetic Ultrathin fcc Co/Cu(100) Films." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/65148992669109376766.

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碩士<br>國立臺灣大學<br>物理學研究所<br>88<br>The crystal structure and magnetic properties, such as Curie temperature Tc, magnetic anisotropy are investigated for the fcc ultrathin magnetic films at variation of growth condition. All experiments are performed in an ultrahigh vacuum (UHV) multi-function chamber equipped with LEED, AES, in-situ MOKE, sputter gun, and film deposit. The Tc of 2 ML Co/Cu(100) rapidly drops down for the growth temperature Tg above 275 K. The Tc of Tg=225 K and Tg=325 K are 325 K and 250 K respectively, and the decrease on Tc is 30 %. The effects of growth condition on the Tc may

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48

"Tuning Anomalous Hall effect and Spin Polarized Current in Magnetic Ultrathin Films." Doctoral diss., 2018. http://hdl.handle.net/2286/R.I.51596.

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abstract: In this dissertation I studied the anomalous Hall effect in MgO/Permalloy/Nonmagnetic Metal(NM) based structure, spin polarized current in YIG/Pt based thin films and the origin of the perpendicular magnetic anisotropy(PMA) in the Ru/Co/Ru based structures. The anomalous Hall effect is the observation of a nonzero voltage difference across a magnetic material transverse to the current that flows through the material and the external magnetic field. Unlike the ordinary Hall effect which is observed in nonmagnetic metals, the anomalous Hall effect is only observed in magnetic materia

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49

CHENG, W. Y., and 鄭文源. "Magnetic properties of Co/Ir(111) ultrathin films: growth and annealing effects." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/41992919475719057634.

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碩士<br>東海大學<br>物理學系<br>92<br>Magnetic properties of ultrathin Co films deposited on a Ir(111) surface at ambient temperature have been studied using surface magneto-optic Kerr effect technique. For Co/Ir(111) films thinner than 2 monolayers (ML), there is not magnetic hysteresis and the films are nonferromagnetic. As the Co thickness increases to above 2 ML, hysteresis occurs on both the longitudinal and polar configurations. The preferred orientation of magnetization for the films is neither on the surface nor perpendicular to the surface plane. Systematic investigations of the Co/Ir(111) film

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50

Chen, Wei-Hsiang, and 陳暐翔. "Surface structure and related magnetic properties of Fe/Ir(111) ultrathin films." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/62390499298329817756.

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