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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
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105313
- ISBN
- 9798265483874
- DDC
- 620.11
- 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
- Disorder
- 키워드
- Magnetism
- 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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■00520260202105313
■006m o d
■007cr#unu||||||||
■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.
