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Publication Citation: Different Dynamic and Static Magnetic Anisotropy in Thin Permalloy Films

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Author(s): Radek Lopusnik; John P. Nibarger; Thomas J. Silva; Zbigniew J. Celinski;
Title: Different Dynamic and Static Magnetic Anisotropy in Thin Permalloy Films
Published: July 06, 2003
Abstract: The values of uniaxial anisotropy Hk in thin polycrystalline Permalloy films measured by static and dynamic methods differ by as much as a factor 1.5. The anisotropy obtained with a pulsed inductive microwave magnetometer in 2.5-100 nm thick Permalloy films exhibits an additional isotropic component of 120-240 A/m not observed in static measurements. The static anisotropy value was obtained with an inductive magnetic hysteresis loop tracer. The time-resolved precessional response was measured as a function of in-plane magnetic applied bias field and the angle between the easy-axis and the applied bias field. We interpret the constant offset field as a transient component of the magnetic anisotropy that affects only dynamical response at time scales below 10 ns.
Citation: Applied Physics Letters
Volume: 83
Issue: 1
Pages: pp. 96 - 98
Keywords: time resolved;magnetic anisotropy;Permalloy;pulsed inductive microwave magnetometer;
Research Areas: Electromagnetics
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