학술논문
Experimental Method for Quantitative Evaluation of Nonlinear Magnetization Dynamics / 非線形磁化ダイナミクスの定量評価法
Document Type
Journal Article
Author
Source
電気学会論文誌A(基礎・材料・共通部門誌) / IEEJ Transactions on Fundamentals and Materials. 2021, 141(2):99
Subject
Language
Japanese
ISSN
0385-4205
1347-5533
1347-5533
Abstract
We have developed an experimental technique to investigate a nonlinear magnetization dynamics resonantly excited by strong microwave fields. In this technique, a magnetization switching was observed when a sub-nanosecond wide pulsed field was applied to the ferromagnetic resonance-excited ferromagnets. Such a cooperative switching with simultaneous application of microwave- and pulsed-fields can evaluate an effective energy barrier for magnetization switching in various nonlinear magnetization dynamics. In this review, we show the experimental results on (1) the temporal evolution of the energy barrier in the transient of magnetization precession growth and (2) the observation of saddle-node bifurcation in the microwave-excited nonlinear magnetization dynamics.