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Frequency-dependent complex permeability in Zr-substituted permalloy thin films

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4 Author(s)
J. B. Youssef ; Lab. de Magnetisme de Bretagne, CNRS, Brest, France ; P. M. Jacquart ; N. Vukadinovic ; H. Le Gall

In this work, we investigate Zr substitution in Permalloy Ni80Fe20 thin films in order to control the magnetic properties and then to tune the resonance frequency at lower values with high permeability levels. The structural transition from a crystalline to an amorphous phase, saturation induction, in-plane anisotropy, electrical resistivity, and frequency-dependent permeability are studied for the Zr content ranging from 0 to 17% at. The high-frequency permeability of these (Ni80Fe20)1-xZrx films is first measured in the 0.1-3-GHz range using a permeameter. Assuming a gyroresonance mechanism, the frequency-dependence of the permeability is studied as a function of the magnetization, anisotropy field, and damping parameter deduced from ferromagnetic resonance characterizations. For a Zr concentration of 17%, a resistivity of 260 μΩ·cm is obtained as well as very soft properties (Hc<0.5 Oe). We also show that the permeability is drastically affected by the Zr substitution with a significant shift of the resonance frequency from 600 to 300 MHz, which correlates with the decrease of the saturation induction and a very low anisotropy.

Published in:

IEEE Transactions on Magnetics  (Volume:38 ,  Issue: 5 )