An effect of the perpendicular anisotropy and eddy currents on the microwave performance of single-layer and multi-layer permalloy filmsстатья

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[1] An effect of the perpendicular anisotropy and eddy currents on the microwave performance of single-layer and multi-layer permalloy films / P. A. Zezyulina, I. T. Iakubov, A. N. Lagarkov et al. // IEEE Magnetics Letters. — 2016. — Vol. 7. — P. 3505804–3505804. In this letter, microwave and magnetostatic measurements of single- and multilayer Permalloy films are made to find physical reasons causing the decrease of the microwave permeability of the films with increase in film thickness. The permeability is measured in the frequency range of 0.1-10 GHz by a coaxial technique. From the measured permeability, a contribution to the effective field from the magnetoelastic effect is determined. The decrease of microwave permeability in thick films is shown to arise mainly due to the perpendicular magnetic anisotropy rather than from the effect of eddy currents, as is frequently suggested. It is also shown that both these effects are reduced in multilayer films comprising alternating magnetic and dielectric layers. Therefore, such films are promising materials for developing magnets that possess high permeability at high frequencies. [ DOI ]

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