Surface magnetic anisotropy in glass-coated amorphous microwires as determined from ferromagnetic resonance measurements

Abstract

[EN] The ferromagnetic resonance frequency of different Co base glass-coated amorphous magnetic microwires about 3.5 mum in diameter with negative, vanishing and positive magnetostriction has been investigated from power absorption measurements in the microwave frequency range. The experimental technique employed here involves the replacement of the dielectric of a coaxial transmission fine by the sample to be measured. From the evolution of the resonance frequency with DC applied magnetic field, the surface magnetic anisotropy field of the microwires has been quantitatively obtained and, as expected, found to depend on the sign and strength of the magnetostriction. Similar values for the surface anisotropy are obtained in comparison with bulk anisotropy as determined from quasi-static hysteresis loops measurements. (C) 2001 Elsevier Science B.V. AII rights reserved.