Different dynamic and static magnetic anisotropy in thin Permalloyâ„¢ films

Lopusnik, R.; Nibarger, J. P.; Silva, T. J.; Celinski, Z.
July 2003
Applied Physics Letters;7/7/2003, Vol. 83 Issue 1, p96
Academic Journal
The values of uniaxial anisotropy H[SUBk] in thin polycrystalline Permalloyâ„¢ 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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