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Systematic Control of Disorder to Direct Magnetic Behavior in Artificial Spin Ice
Systematic Control of Disorder to Direct Magnetic Behavior in Artificial Spin Ice
Systematic Control of Disorder to Direct Magnetic Behavior in Artificial Spin Ice

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자료유형  
 학위논문 서양
최종처리일시  
20260202105313
ISBN  
9798265483874
DDC  
620.11
저자명  
Cote, Timothy Reese.
서명/저자  
Systematic Control of Disorder to Direct Magnetic Behavior in Artificial Spin Ice
발행사항  
[Sl] : Northwestern University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
193 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
주기사항  
Advisor: Petford-Long, Amanda K.
학위논문주기  
Thesis (Ph.D.)--Northwestern University, 2025.
초록/해제  
요약Artificial spin ices (ASIs) are premier systems for investigating frustrated magnetic behavior, enabling precise control over system design to manipulate the magnetic energies that give rise to emergent phenomena. Extensive efforts to determine the effects of geometry on frustrated behavior have examined ASI lattices ranging from periodic to aperiodic to disordered. Understanding the influence of disorder on ASI behavior remains nascent but has already revealed behaviors not observed in ordered lattices. In this work, I use a systematic method of introducing disorder into rhombus artificial spin ice (RASI) lattices to investigate the role of disorder on magnetic behavior. Disorder is quantified through a geometric order parameter, which is used to design RASIs with different symmetries and lattice order. By characterizing magnetic configurations using Lorentz transmission electron microscopy (LTEM) and micromagnetic modeling, the energetic landscape of the RASI lattices is explored. Two features strongly influence magnetic behavior: (1) vertex motifs with local three-fold symmetry and (2) extended chains of strongly-coupled nanomagnets. Highly ordered geometries composed of features (1) or (2), as well as a highly disordered geometry containing both features (1) and (2), exhibit greater ability to lower system energy following rotational demagnetization. Simulated magnetization reversal of the RASIs is also examined, revealing the roles of global lattice symmetry and sublattice ordering in producing isotropic or anisotropic reversal behavior. Insights from these simulations are then utilized to design applied field protocols for controlling RASI magnetic configurations. Finally, I investigate domain-wall behavior in Galton-board-inspired nanomagnetic geometries, relating localized structural variations to stochastic domain-wall propagation. This work demonstrates that systematically controlling nanomagnetic geometry provides a practical means of tailoring emergent magnetic behavior.
일반주제명  
Materials science
일반주제명  
Engineering
키워드  
Artificial spin ices
키워드  
Disorder
키워드  
Magnetism
키워드  
Rhombus artificial spin ice
기타저자  
Northwestern University Materials Science and Engineering
기본자료저록  
Dissertations Abstracts International. 87-06B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■020    ▼a9798265483874
■035    ▼a(MiAaPQ)AAI32285358
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a620.11
■1001  ▼aCote,  Timothy  Reese.
■24510▼aSystematic  Control  of  Disorder  to  Direct  Magnetic  Behavior  in  Artificial  Spin  Ice
■260    ▼a[Sl]▼bNorthwestern  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a193  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-06,  Section:  B.
■500    ▼aAdvisor:  Petford-Long,  Amanda  K.
■5021  ▼aThesis  (Ph.D.)--Northwestern  University,  2025.
■520    ▼aArtificial  spin  ices  (ASIs)  are  premier  systems  for  investigating  frustrated  magnetic  behavior,  enabling  precise  control  over  system  design  to  manipulate  the  magnetic  energies  that  give  rise  to  emergent  phenomena.  Extensive  efforts  to  determine  the  effects  of  geometry  on  frustrated  behavior  have  examined  ASI  lattices  ranging  from  periodic  to  aperiodic  to  disordered.  Understanding  the  influence  of  disorder  on  ASI  behavior  remains  nascent  but  has  already  revealed  behaviors  not  observed  in  ordered  lattices.  In  this  work,  I  use  a  systematic  method  of  introducing  disorder  into  rhombus  artificial  spin  ice  (RASI)  lattices  to  investigate  the  role  of  disorder  on  magnetic  behavior.  Disorder  is  quantified  through  a  geometric  order  parameter,  which  is  used  to  design  RASIs  with  different  symmetries  and  lattice  order.  By  characterizing  magnetic  configurations  using  Lorentz  transmission  electron  microscopy  (LTEM)  and  micromagnetic  modeling,  the  energetic  landscape  of  the  RASI  lattices  is  explored.  Two  features  strongly  influence  magnetic  behavior:  (1)  vertex  motifs  with  local  three-fold  symmetry  and  (2)  extended  chains  of  strongly-coupled  nanomagnets.  Highly  ordered  geometries  composed  of  features  (1)  or  (2),  as  well  as  a  highly  disordered  geometry  containing  both  features  (1)  and  (2),  exhibit  greater  ability  to  lower  system  energy  following  rotational  demagnetization.  Simulated  magnetization  reversal  of  the  RASIs  is  also  examined,  revealing  the  roles  of  global  lattice  symmetry  and  sublattice  ordering  in  producing  isotropic  or  anisotropic  reversal  behavior.  Insights  from  these  simulations  are  then  utilized  to  design  applied  field  protocols  for  controlling  RASI  magnetic  configurations.  Finally,  I  investigate  domain-wall  behavior  in  Galton-board-inspired  nanomagnetic  geometries,  relating  localized  structural  variations  to  stochastic  domain-wall  propagation.  This  work  demonstrates  that  systematically  controlling  nanomagnetic  geometry  provides  a  practical  means  of  tailoring  emergent  magnetic  behavior.
■590    ▼aSchool  code:  0163.
■650  4▼aMaterials  science
■650  4▼aEngineering
■653    ▼aArtificial  spin  ices
■653    ▼aDisorder
■653    ▼aMagnetism
■653    ▼aRhombus  artificial  spin  ice
■690    ▼a0794
■690    ▼a0537
■71020▼aNorthwestern  University▼bMaterials  Science  and  Engineering.
■7730  ▼tDissertations  Abstracts  International▼g87-06B.
■790    ▼a0163
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360163▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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