Inertial effect on minimum magnetic field for magnetization reversal in ultrafast magnetism

doi:10.1088/1674-1056/acd3de

中国物理B ›› 2023, Vol. 32 ›› Issue (12): 127506-127506.doi: 10.1088/1674-1056/acd3de

Inertial effect on minimum magnetic field for magnetization reversal in ultrafast magnetism

Xue-Meng Nan(南雪萌)¹, Chuan Qu(屈川)¹, Peng-Bin He(贺鹏斌)², and Zai-Dong Li(李再东)^1,†

1 Tianjin Key Laboratory of Quantum Optics and Intelligent Photonics, School of Science, Tianjin University of Technology, Tianjin 300384, China;
2 School of Physics and Electronics, Hunan University, Changsha 410082, China

收稿日期:2023-01-07 修回日期:2023-04-28 接受日期:2023-05-10 出版日期:2023-11-14 发布日期:2023-11-14
通讯作者: Zai-Dong Li E-mail:lizd@email.tjut.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No.61774001), the Program of State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, China (Grant No.KF202203), the NSF of Changsha City (Grant No.kq2208008), and the NSF of Hunan Province (Grant No.2023JJ30116).

Inertial effect on minimum magnetic field for magnetization reversal in ultrafast magnetism

Xue-Meng Nan(南雪萌)¹, Chuan Qu(屈川)¹, Peng-Bin He(贺鹏斌)², and Zai-Dong Li(李再东)^1,†

1 Tianjin Key Laboratory of Quantum Optics and Intelligent Photonics, School of Science, Tianjin University of Technology, Tianjin 300384, China;
2 School of Physics and Electronics, Hunan University, Changsha 410082, China

Received:2023-01-07 Revised:2023-04-28 Accepted:2023-05-10 Online:2023-11-14 Published:2023-11-14
Contact: Zai-Dong Li E-mail:lizd@email.tjut.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No.61774001), the Program of State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, China (Grant No.KF202203), the NSF of Changsha City (Grant No.kq2208008), and the NSF of Hunan Province (Grant No.2023JJ30116).

摘要/Abstract

摘要： In the field of ultrafast magnetism, i.e., subpicosecond or femtosecond time scales, the dynamics of magnetization can be described by the inertial Landau-Lifhitz-Gilbert equation. In terms of this equation, the intrinsic characteristics are investigated in detail for the theoretical limit of the magnetization reversal field. We can find that there is a critical value for the inertia parameter τ_c, which is affected by the damping and anisotropy parameter of the system. When the inertial parameter factor τ<τ_c, the limit value of the magnetization reversal field under the ultrafast magnetic mechanism is smaller than that of the fast magnetic mechanism. When τ>τ_c, the limit value of the magnetization reversal field will be larger than the limit value under the fast magnetic mechanism. Moreover, it is important to point out that the limit value of the magnetization reversal field under the ultrafast magnetic mechanism decreases with the increasing inertial factor, as τ<τ_c/2, which increases with inertial factor τ as τ>τ_c/2. Finally, with the joint action of damping and anisotropy, compared with fast magnetism, we find that the limit value of the magnetization reversal field has rich variation characteristics, i.e., there is not only a linear and proportional relationship, but also an inverse relationship, which is very significant for the study of ultrafast magnetism.

关键词: inertial effect, minimum magnetic field, ultrafast magnetism

Abstract: In the field of ultrafast magnetism, i.e., subpicosecond or femtosecond time scales, the dynamics of magnetization can be described by the inertial Landau-Lifhitz-Gilbert equation. In terms of this equation, the intrinsic characteristics are investigated in detail for the theoretical limit of the magnetization reversal field. We can find that there is a critical value for the inertia parameter τ_c, which is affected by the damping and anisotropy parameter of the system. When the inertial parameter factor τ<τ_c, the limit value of the magnetization reversal field under the ultrafast magnetic mechanism is smaller than that of the fast magnetic mechanism. When τ>τ_c, the limit value of the magnetization reversal field will be larger than the limit value under the fast magnetic mechanism. Moreover, it is important to point out that the limit value of the magnetization reversal field under the ultrafast magnetic mechanism decreases with the increasing inertial factor, as τ<τ_c/2, which increases with inertial factor τ as τ>τ_c/2. Finally, with the joint action of damping and anisotropy, compared with fast magnetism, we find that the limit value of the magnetization reversal field has rich variation characteristics, i.e., there is not only a linear and proportional relationship, but also an inverse relationship, which is very significant for the study of ultrafast magnetism.

Key words: inertial effect, minimum magnetic field, ultrafast magnetism

中图分类号: (Magnetization dynamics)

75.78.-n

71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect) 72.25.Rb (Spin relaxation and scattering)

Xue-Meng Nan(南雪萌), Chuan Qu(屈川), Peng-Bin He(贺鹏斌), and Zai-Dong Li(李再东). Inertial effect on minimum magnetic field for magnetization reversal in ultrafast magnetism[J]. 中国物理B, 2023, 32(12): 127506-127506.

Xue-Meng Nan(南雪萌), Chuan Qu(屈川), Peng-Bin He(贺鹏斌), and Zai-Dong Li(李再东). Inertial effect on minimum magnetic field for magnetization reversal in ultrafast magnetism[J]. Chin. Phys. B, 2023, 32(12): 127506-127506.

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Inertial effect on minimum magnetic field for magnetization reversal in ultrafast magnetism

Inertial effect on minimum magnetic field for magnetization reversal in ultrafast magnetism

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