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Composite-anisotropy amorphous magnetic materials for high-frequency devices

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3 Author(s)
Lee, D.W. ; Department of Materials Science and Engineering, Stanford University, 476 Lomita Mall, Stanford, California 94305-4045 ; Crawford, A.M. ; Wang, S.X.

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In-plane biaxial anisotropy in permeability, desired for integrated inductor cores, was achieved using a composite-anisotropy sandwiched structure. With Tb-doped CoTaZr alloy as the material for magnetic layers, the permeability of the composite film was close to 50% of that of blanket film along the easy axes of both top and bottom magnetic layers, and the ferromagnetic-resonance frequencies were about 2 GHz. Simulations show that the integrated inductors with the composite film as their magnetic cores have inductances near a half of that for the ideal isotropic permeability case.

Published in:

Journal of Applied Physics  (Volume:97 ,  Issue: 10 )