Abstract

The permeability μ and resonant frequency fr of stripe domain ferrite doped CoFe thin films are enhanced from 14 to 22 and 6.0 GHz to 6.4 GHz, respectively, by using Ta buffer layer. The observed enhancement of both permeability and resonant frequency seems to deviate from Snoek's law which expects the value of μ decrease as the fr increases. Compared to the case of using Permalloy (Ni80Fe20) buffer layer where μ is enhanced to 25 and fr is reduced to 4.1 GHz, the present result suggests that the employment of Ta buffer layer may be useful in the quest for high permeability magnetic thin films at GHz frequency range.

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