東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Structure and Dynamics of Magnetic D...

Huang, Siying,

Linked to FindBook

Google Book

Amazon

博客來

Structure and Dynamics of Magnetic Domain Walls in Multi-Sublattice Magnetic Oxides /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Structure and Dynamics of Magnetic Domain Walls in Multi-Sublattice Magnetic Oxides // Siying Huang.
Author:	Huang, Siying,
Description:	1 electronic resource (169 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-08, Section: B.
Contained By:	Dissertations Abstracts International86-08B.
Subject:	Crystal structure. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31851135
ISBN:	9798304943673

Structure and Dynamics of Magnetic Domain Walls in Multi-Sublattice Magnetic Oxides /
Huang, Siying,

Structure and Dynamics of Magnetic Domain Walls in Multi-Sublattice Magnetic Oxides /Siying Huang. - 1 electronic resource (169 pages)

Source: Dissertations Abstracts International, Volume: 86-08, Section: B.

Spintronics is a study that lies at the intersection of magnetics and electronics, which makes use of the electron spin in solid-state devices for data storage and manipulation. A promising future spintronic technology is racetrack memory, where magnetic domain walls (DWs) are encoded with bits of information and are translated by currents on thin-film racetrack devices. What enables the current-driven motion of the DW is its Neel character, generally stabilized by the Dzyaloshinskii-Moriya interaction (DMI). Fast DW motion of the order of km/s was shown in multi-sublattice metallic systems, overcoming the fundamental limits in ferromagnetic systems through angular momentum compensation of the sublattices. Recently, DMI and even faster DW motion have been observed in thin-film rare-earth iron garnets. However, the net angular momentum in such systems is shown to be far from angular momentum compensation. Moreover, the mechanism of the DMI in garnets is shown to be distinct from the metallic systems, thus requiring further understanding as well. In this thesis, we examine magnetic DWs in such multi-sublattice magnetic oxides. We demonstrate a strong tunability of the DMI by a factor of 7 through the substrate in Pt/garnet thin films, providing further understanding of the DMI mechanism. For the anomalously fast DW motion, we present an explanation by the field-like torque counteracting the damping-like torque and increasing the spin Hall efficiency. We propose measuring the DW velocity with a transverse field applied to probe this field-like torque, and present experimental evidence. We investigated the DW depinning dynamics in Pt/BiYIG thin film, presenting a phase diagram of this pinning event, which proves the crucial role of minimizing the pinning effect in achieving fast DW velocity. In EuIG(110) thin film with strong in-plane anisotropy, we demonstrate bistable Neel DW states interchangeable by in-plane field pulse-driven incoherent DW reversal, from which we extract for the first time the Bloch line energetics. Besides the above DW Neel character stabilization, we also provide a DW position stabilization on the racetracks by the exchange bias effect in Pt/Co/Pt/Co₀.₈Ni₀.₂O thin films. This thesis provides a comprehensive understanding of the stability and dynamics of DWs on racetrack devices based on magnetic oxides, from the aspects of both scientific understanding and technical optimizations, paving a path to future innovation and optimization in racetrack memory device design.

English

ISBN: 9798304943673Subjects--Topical Terms:

3561040
Crystal structure.
Subjects--Index Terms:

Domain walls

Structure and Dynamics of Magnetic Domain Walls in Multi-Sublattice Magnetic Oxides /
LDR:03957nmm a22004213i 4500 001 2433814
005 20250905091019.5
006 m o d
007 cr|nu||||||||
008 261011s2024 miu||||||m |||||||eng d
020 $a 9798304943673
035 $a (MiAaPQD)AAI31851135
035 $a (MiAaPQD)MIT17211157065
035 $a AAI31851135
040 $a MiAaPQD $b eng $c MiAaPQD $e rda
100 1 $a Huang, Siying, $e author. $3 3823574
245 1 0 $a Structure and Dynamics of Magnetic Domain Walls in Multi-Sublattice Magnetic Oxides / $c Siying Huang.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2024
300 $a 1 electronic resource (169 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 86-08, Section: B.
500 $a Advisors: Beach, Geoffrey S. D. Committee members: Macfarlane, Robert J.
502 $b Ph.D. $c Massachusetts Institute of Technology $d 2024.
520 $a Spintronics is a study that lies at the intersection of magnetics and electronics, which makes use of the electron spin in solid-state devices for data storage and manipulation. A promising future spintronic technology is racetrack memory, where magnetic domain walls (DWs) are encoded with bits of information and are translated by currents on thin-film racetrack devices. What enables the current-driven motion of the DW is its Neel character, generally stabilized by the Dzyaloshinskii-Moriya interaction (DMI). Fast DW motion of the order of km/s was shown in multi-sublattice metallic systems, overcoming the fundamental limits in ferromagnetic systems through angular momentum compensation of the sublattices. Recently, DMI and even faster DW motion have been observed in thin-film rare-earth iron garnets. However, the net angular momentum in such systems is shown to be far from angular momentum compensation. Moreover, the mechanism of the DMI in garnets is shown to be distinct from the metallic systems, thus requiring further understanding as well. In this thesis, we examine magnetic DWs in such multi-sublattice magnetic oxides. We demonstrate a strong tunability of the DMI by a factor of 7 through the substrate in Pt/garnet thin films, providing further understanding of the DMI mechanism. For the anomalously fast DW motion, we present an explanation by the field-like torque counteracting the damping-like torque and increasing the spin Hall efficiency. We propose measuring the DW velocity with a transverse field applied to probe this field-like torque, and present experimental evidence. We investigated the DW depinning dynamics in Pt/BiYIG thin film, presenting a phase diagram of this pinning event, which proves the crucial role of minimizing the pinning effect in achieving fast DW velocity. In EuIG(110) thin film with strong in-plane anisotropy, we demonstrate bistable Neel DW states interchangeable by in-plane field pulse-driven incoherent DW reversal, from which we extract for the first time the Bloch line energetics. Besides the above DW Neel character stabilization, we also provide a DW position stabilization on the racetracks by the exchange bias effect in Pt/Co/Pt/Co₀.₈Ni₀.₂O thin films. This thesis provides a comprehensive understanding of the stability and dynamics of DWs on racetrack devices based on magnetic oxides, from the aspects of both scientific understanding and technical optimizations, paving a path to future innovation and optimization in racetrack memory device design.
546 $a English
590 $a School code: 0753
650 4 $a Crystal structure. $3 3561040
650 4 $a Energy. $3 876794
650 4 $a Electromagnetism. $3 522050
650 4 $a Thin films. $3 626403
650 4 $a Asymmetry. $3 3562922
650 4 $a Symmetry. $3 536815
650 4 $a Electromagnetics. $3 3173223
650 4 $a Materials science. $3 543314
653 $a Domain walls
653 $a Ferromagnetic systems
653 $a Spintronics
690 $a 0791
690 $a 0794
690 $a 0607
710 2 $a Massachusetts Institute of Technology. $b Department of Materials Science and Engineering. $e degree granting institution. $3 3823568
720 1 $a Beach, Geoffrey S. D. $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 86-08B.
790 $a 0753
791 $a Ph.D.
792 $a 2024
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31851135