1. Inertial effect on minimum magnetic field for magnetization reversal in ultrafast magnetism
- Author
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Xue-Meng Nan, Chuan Qu, Peng-Bin He, and Zai-Dong Li
- Subjects
General Physics and Astronomy - 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 is 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 τc , which is affected by the damping and anisotropy parameter of the system. When the inertial parameter factor τ < τc , the limit value of the magnetization reversal field under the ultrafast magnetic mechanism is less than that of the fast magnetic mechanism. When τ > τc , the limit value of the magnetization reversal field will be greater 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 < τc /2, while increases with inertial factor τ as τ > τc /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.
- Published
- 2023