Different Dynamic and Static Magnetic Anisotropy in Thin Permalloy Films

Published

July 6, 2003

Author(s)

Radek Lopusnik, John P. Nibarger, Thomas J. Silva, Zbigniew J. Celinski

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

Pub Type

Journals

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Keywords

time resolved, magnetic anisotropy, Permalloy, pulsed inductive microwave magnetometer

Citation

Lopusnik, R. , Nibarger, J. , Silva, T. and Celinski, Z. (2003), Different Dynamic and Static Magnetic Anisotropy in Thin Permalloy Films, Applied Physics Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=30763 (Accessed November 3, 2025)