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High-Frequency Characteristics of Metal/Native-Oxide Multilayers



Geoffrey S. Beach, Thomas J. Silva, F. T. Parker, A. E. Berkowitz


The high-frequency magnetization dynamics of magnetically soft CoχFe100-χ metal/native-oxide multilayers were studied as a function of alloy composition (10 {less than or equal to} χ {less than or equal to} 50) using a time-domain inductive technique. The data show intrinsic resonance frequencies ranging from 2.1 to 3.7 GHz due to the variation of anisotropy field with χ. The frequencies are consistent with a simple ferromagnetic resonance (FMR) response, with the dynamical anisotropy field equal to the static anisotropy field. The large dc permeabilities, ranging from 200 to 1000, are therefore maintained at high frequency. The combination of high permeability, high resonance frequency, low damping, and a tunable anisotropy field, along with a high resistivity, make this system ideally suited to high-frequency applications.
IEEE Transactions on Magnetics


high-frequency magnetization dynamics, high-permeability thin films, soft magnetic materials
Created September 5, 2003, Updated February 19, 2017