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Engineering Novel Magnetic Insulators for Energy Efficient Devices
Engineering Novel Magnetic Insulators for Energy Efficient Devices
Engineering Novel Magnetic Insulators for Energy Efficient Devices

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211153049
ISBN  
9798346389385
DDC  
530.4
저자명  
Channa, Sanyum.
서명/저자  
Engineering Novel Magnetic Insulators for Energy Efficient Devices
발행사항  
[Sl] : Stanford University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
262 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-05, Section: B.
주기사항  
Advisor: Suzuki, Yuri.
학위논문주기  
Thesis (Ph.D.)--Stanford University, 2024.
초록/해제  
요약This chapter covers several experimental techniques used to fabricate and characterize the films in this dissertation. Section 2.2 begins with an overview of the various thin film deposition techniques - pulsed laser deposition, sputtering and electron beam evaporation - used to grow the films and multilayers that form the basis of this thesis. Section 2.3 covers the fabrication techniques - photolithography, argon ion milling and oxygen plasma ashing - used to create complex micro-structures for studying various spin-based phenomena. Section 2.4 briefly describes all the physical characterization tools - atomic force microscopy, X-ray diffraction and reflectivity, and scanning transmission electron microscopy - used to quantify the crystalline quality and other relevant physical properties of our films. Section 2.5 delves into the techniques that help quantify both static and dynamic magnetic properties of our magnetic films, namely SQUID magnetometry and ferromagnetc resonance respectively. In this section, I also discuss X-ray absorption spectroscopy, a technique that allows for an element-specific study of a system's magnetization. Additionally, I discuss magnetic force microscopy, a cousin to atomic force microscopy, that provides a surface sensitive probe into the magnetic textures in a system. Finally, in Section 2.6, I briefly describe the various instrumentation that enable electrical transport measurements. The brief overview of techniques in this chapter forms a basis in understanding later results. More detailed background into each characterization technique will be introduced as needed in their respective chapters.2.2 Thin Film DepositionA variety of thin film deposition techniques have been developed to grow different types of materials since there is no single all-encompassing technique. In this section, we discuss 3 such techniques - sputtering, electron beam evaporation and pulsed laser deposition. Sputtering works very well for depositing high quality films of most metals and some dielectrics. Electron beam evaporation is well suited for depositing metals with high melting points since it significantly heats up the target surface. Pulsed laser deposition however does not work well for metals since they have a high surface reflectivity; conversely, insulators readily absorb the laser energy and ablate making this a great technique for the stoichiometric deposition of complex oxides.2.2.1 Pulsed Laser DepositionLAFO films were grown using pulsed laser deposition (PLD) in a home-built PLD chamber. PLD is an experimental technique used for the stoichiometric transfer of material from a solid source onto a substrate. This technique has been reported in literature as early as 1965, and since then has been used extensively for growing complex oxide films, interfaces, and heterostructures [1].A schematic of the PLD chamber is shown in Figure 2.1. A pressed ceramic target made of the material to be grown is attached onto a rotating target holder. The substrate is mounted onto a heater at the opposing end using silver paste. Afterwards, the chamber is pumped down to a base pressure of 10−7torr. To initiate the deposition, a KrF (248 nm) excimer laser (Coherent LPXpro) with 20 ns pulses ablates the target at a frequency of a few Hz as the target rotates. The laser pulse thermalizes the species at the target surface, launching them outwards in the form of a plasma plume towards the substrate.
일반주제명  
Interferometry
일반주제명  
Spectrum analysis
일반주제명  
Electromagnetism
일반주제명  
Microscopy
일반주제명  
Anisotropy
일반주제명  
Engineering
일반주제명  
Magnetism
일반주제명  
Energy consumption
일반주제명  
Thin films
일반주제명  
Lithium
일반주제명  
Analytical chemistry
일반주제명  
Condensed matter physics
일반주제명  
Electromagnetics
일반주제명  
Energy
일반주제명  
Materials science
일반주제명  
Optics
기타저자  
Stanford University.
기본자료저록  
Dissertations Abstracts International. 86-05B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aChanna,  Sanyum.
■24510▼aEngineering  Novel  Magnetic  Insulators  for  Energy  Efficient  Devices
■260    ▼a[Sl]▼bStanford  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a262  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-05,  Section:  B.
■500    ▼aAdvisor:  Suzuki,  Yuri.
■5021  ▼aThesis  (Ph.D.)--Stanford  University,  2024.
■520    ▼aThis  chapter  covers  several  experimental  techniques  used  to  fabricate  and  characterize  the  films  in  this  dissertation.  Section  2.2  begins  with  an  overview  of  the  various  thin  film  deposition  techniques  -  pulsed  laser  deposition,  sputtering  and  electron  beam  evaporation  -  used  to  grow  the  films  and  multilayers  that  form  the  basis  of  this  thesis.  Section  2.3  covers  the  fabrication  techniques  -  photolithography,  argon  ion  milling  and  oxygen  plasma  ashing  -  used  to  create  complex  micro-structures  for  studying  various  spin-based  phenomena.  Section  2.4  briefly  describes  all  the  physical  characterization  tools  -  atomic  force  microscopy,  X-ray  diffraction  and  reflectivity,  and  scanning  transmission  electron  microscopy  -  used  to  quantify  the  crystalline  quality  and  other  relevant  physical  properties  of  our  films.  Section  2.5  delves  into  the  techniques  that  help  quantify  both  static  and  dynamic  magnetic  properties  of  our  magnetic  films,  namely  SQUID  magnetometry  and  ferromagnetc  resonance  respectively.  In  this  section,  I  also  discuss  X-ray  absorption  spectroscopy,  a  technique  that  allows  for  an  element-specific  study  of  a  system's  magnetization.  Additionally,  I  discuss  magnetic  force  microscopy,  a  cousin  to  atomic  force  microscopy,  that  provides  a  surface  sensitive  probe  into  the  magnetic  textures  in  a  system.  Finally,  in  Section  2.6,  I  briefly  describe  the  various  instrumentation  that  enable  electrical  transport  measurements.  The  brief  overview  of  techniques  in  this  chapter  forms  a  basis  in  understanding  later  results.  More  detailed  background  into  each  characterization  technique  will  be  introduced  as  needed  in  their  respective  chapters.2.2  Thin  Film  DepositionA  variety  of  thin  film  deposition  techniques  have  been  developed  to  grow  different  types  of  materials  since  there  is  no  single  all-encompassing  technique.  In  this  section,  we  discuss  3  such  techniques  -  sputtering,  electron  beam  evaporation  and  pulsed  laser  deposition.  Sputtering  works  very  well  for  depositing  high  quality  films  of  most  metals  and  some  dielectrics.  Electron  beam  evaporation  is  well  suited  for  depositing  metals  with  high  melting  points  since  it  significantly  heats  up  the  target  surface.  Pulsed  laser  deposition  however  does  not  work  well  for  metals  since  they  have  a  high  surface  reflectivity;  conversely,  insulators  readily  absorb  the  laser  energy  and  ablate  making  this  a  great  technique  for  the  stoichiometric  deposition  of  complex  oxides.2.2.1  Pulsed  Laser  DepositionLAFO  films  were  grown  using  pulsed  laser  deposition  (PLD)  in  a  home-built  PLD  chamber.  PLD  is  an  experimental  technique  used  for  the  stoichiometric  transfer  of  material  from  a  solid  source  onto  a  substrate.  This  technique  has  been  reported  in  literature  as  early  as  1965,  and  since  then  has  been  used  extensively  for  growing  complex  oxide  films,  interfaces,  and  heterostructures  [1].A  schematic  of  the  PLD  chamber  is  shown  in  Figure  2.1.  A  pressed  ceramic  target  made  of  the  material  to  be  grown  is  attached  onto  a  rotating  target  holder.  The  substrate  is  mounted  onto  a  heater  at  the  opposing  end  using  silver  paste.  Afterwards,  the  chamber  is  pumped  down  to  a  base  pressure  of  10−7torr.  To  initiate  the  deposition,  a  KrF  (248  nm)  excimer  laser  (Coherent  LPXpro)  with  20  ns  pulses  ablates  the  target  at  a  frequency  of  a  few  Hz  as  the  target  rotates.  The  laser  pulse  thermalizes  the  species  at  the  target  surface,  launching  them  outwards  in  the  form  of  a  plasma  plume  towards  the  substrate.
■590    ▼aSchool  code:  0212.
■650  4▼aInterferometry
■650  4▼aSpectrum  analysis
■650  4▼aElectromagnetism
■650  4▼aMicroscopy
■650  4▼aAnisotropy
■650  4▼aEngineering
■650  4▼aMagnetism
■650  4▼aEnergy  consumption
■650  4▼aThin  films
■650  4▼aLithium
■650  4▼aAnalytical  chemistry
■650  4▼aCondensed  matter  physics
■650  4▼aElectromagnetics
■650  4▼aEnergy
■650  4▼aMaterials  science
■650  4▼aOptics
■690    ▼a0537
■690    ▼a0486
■690    ▼a0611
■690    ▼a0607
■690    ▼a0791
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■71020▼aStanford  University.
■7730  ▼tDissertations  Abstracts  International▼g86-05B.
■790    ▼a0212
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164810▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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