Different dynamic and static magnetic anisotropy in thin Permalloy™ films

被引:60
作者
Lopusnik, R [1 ]
Nibarger, JP [1 ]
Silva, TJ [1 ]
Celinski, Z [1 ]
机构
[1] Natl Inst Stand & Technol, Magnet Technol Div, Boulder, CO 80305 USA
关键词
D O I
10.1063/1.1587255
中图分类号
O59 [应用物理学];
学科分类号
摘要
The values of uniaxial anisotropy H-k in thin polycrystalline Permalloy(TM) films measured by static and dynamic methods differ by as much as a factor of 1.5. The anisotropy obtained with a pulsed inductive microwave magnetometer in 2.5 to 100 nm thick Permalloy films exhibits an additional isotropic component of 120 to 240 A/m not observed in static measurements. The static value of anisotropy was obtained with an inductive magnetic hysteresis loop tracer. The time-resolved precessional response was measured as a function of in-plane applied magnetic bias field and the angle between the easy axis and that of the applied bias field. We interpret the constant-offset field as a transient component of the magnetic susceptibility that affects only dynamical response at time scales below 10 ns.
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收藏
页码:96 / 98
页数:3
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