Inertial terms to magnetization dynamics in ferromagnetic thin films

被引：37
|
作者：
Li, Y. [1 ,2 ]
Barra, A. -L. [3 ]
Auffret, S. [2 ,4 ,5 ]
Ebels, U. [2 ,4 ,5 ]
Bailey, W. E. [1 ]
机构：
[1] Columbia Univ, Dept Appl Phys & Appl Math, Mat Sci & Engn, New York, NY 10027 USA
[2] CNRS, SPINTEC, F-38000 Grenoble, France
[3] CNRS, UJF, UPS, Lab Natl Champs Magnet Intenses,INSA, F-38042 Grenoble, France
[4] Univ Grenoble Alpes, INAC, SPINTEC, F-38000 Grenoble, France
[5] CEA, INAC, SPINTEC, F-38000 Grenoble, France
来源：
PHYSICAL REVIEW B | 2015年 / 92卷 / 14期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1103/PhysRevB.92.140413
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Inertial magnetization dynamics have been predicted at ultrahigh speeds, or frequencies approaching the inverse Drude scattering time, in ferromagnetic metals. Here, we identify inertial terms to magnetization dynamics in thin Ni79Fe21 and Co films near room temperature. Effective magnetic fields measured in high-frequency ferromagnetic resonance (115-345 GHz) show an additional stiffening term which is quadratic in frequency and similar to 80 mT at the high-frequency limit of our experiment. Our results extend understanding of magnetization dynamics at picosecond time scales.
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页数：5
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