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Magnetism of Two-Dimensional Ferroma...

Ibrahim, Essa Muhammad.

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Magnetism of Two-Dimensional Ferromagnetic Materials.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Magnetism of Two-Dimensional Ferromagnetic Materials./
作者:	Ibrahim, Essa Muhammad.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
面頁冊數:	77 p.
附註:	Source: Dissertations Abstracts International, Volume: 85-06, Section: B.
Contained By:	Dissertations Abstracts International85-06B.
標題:	Physics. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30813951
ISBN:	9798381176230

Magnetism of Two-Dimensional Ferromagnetic Materials.
Ibrahim, Essa Muhammad.

Magnetism of Two-Dimensional Ferromagnetic Materials. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 77 p.

Source: Dissertations Abstracts International, Volume: 85-06, Section: B.

Thesis (Ph.D.)--The University of Arizona, 2023.

This item must not be sold to any third party vendors.

In recent years, the discovery of numerous two-dimensional (2D) magnetic materials exhibiting unique magnetic and spin transport properties has opened up new possibilities for spintronics applications. While long-range ferromagnetic ordering is theoretically unstable in 2D systems due to strong thermal fluctuations, this can be overcome by introducing anisotropy, which breaks continuous symmetry and allows for the emergence of long-range order. But still, the magnetization magnitude in 2D systems depends on both the exchange interaction and the total effective field, even at low temperatures, in contrast to 3D systems in which the magnetization magnitude only depends on the exchange interaction. Thus, two-dimensional magnetization is fundamentally different than three-dimensional magnetization.In this dissertation, we employ a self-consistent Random Phase Approximation to analytically investigate magnetization in 2D systems, accounting for the significant spin fluctuations. We examine the impact of random fields on 2D magnets and reveal a shift from a second-order to a first-order phase transition. Additionally, we develop a two-dimensional quantum Stoner-Wohlfarth model, demonstrating the temperature dependence of hysteresis and astroid diagrams, which differs from the 3D case. Finally, our simulation of the magnetization reversal dynamics in a 2D single-domain magnet shows that the process usually involves magnetization collapse followed by remagnetization in the direction of the external field, resulting in a significantly shorter reversal time.

ISBN: 9798381176230Subjects--Topical Terms:

516296
Physics.
Subjects--Index Terms:

Magnetic switching

Magnetism of Two-Dimensional Ferromagnetic Materials.
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300 $a 77 p.
500 $a Source: Dissertations Abstracts International, Volume: 85-06, Section: B.
500 $a Advisor: Zhang, Shufeng.
502 $a Thesis (Ph.D.)--The University of Arizona, 2023.
506 $a This item must not be sold to any third party vendors.
520 $a In recent years, the discovery of numerous two-dimensional (2D) magnetic materials exhibiting unique magnetic and spin transport properties has opened up new possibilities for spintronics applications. While long-range ferromagnetic ordering is theoretically unstable in 2D systems due to strong thermal fluctuations, this can be overcome by introducing anisotropy, which breaks continuous symmetry and allows for the emergence of long-range order. But still, the magnetization magnitude in 2D systems depends on both the exchange interaction and the total effective field, even at low temperatures, in contrast to 3D systems in which the magnetization magnitude only depends on the exchange interaction. Thus, two-dimensional magnetization is fundamentally different than three-dimensional magnetization.In this dissertation, we employ a self-consistent Random Phase Approximation to analytically investigate magnetization in 2D systems, accounting for the significant spin fluctuations. We examine the impact of random fields on 2D magnets and reveal a shift from a second-order to a first-order phase transition. Additionally, we develop a two-dimensional quantum Stoner-Wohlfarth model, demonstrating the temperature dependence of hysteresis and astroid diagrams, which differs from the 3D case. Finally, our simulation of the magnetization reversal dynamics in a 2D single-domain magnet shows that the process usually involves magnetization collapse followed by remagnetization in the direction of the external field, resulting in a significantly shorter reversal time.
590 $a School code: 0009.
650 4 $a Physics. $3 516296
650 4 $a Theoretical physics. $3 2144760
650 4 $a Condensed matter physics. $3 3173567
653 $a Magnetic switching
653 $a Magnetism
653 $a Magnetization dynamics
653 $a Quantum Stoner Wohlfarth model
653 $a Random fields
653 $a Two-dimensional magnets
653 $a Spintronics
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690 $a 0753
690 $a 0611
710 2 $a The University of Arizona. $b Physics. $3 1679122
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793 $a English
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