Analysis of current distribution in magnetic film inductors

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Abstract
We have extended our electromagnetic model for high-frequency magnetic film inductors [A. Gromov, V. Korenivski, K. V. Rao, R. B. van Dover, and P. M. Mankiewich, IEEE Trans. Magn. 34, 1246 (1998)] to account for driving current redistribution in structures where the conductor and the magnetic film are in direct electrical contact. We consider a stripe conductor of a rectangular cross section enclosed in a magnetic film. A potential difference of fixed amplitude is applied to both the conductor and the magnetic film. Maxwell’s equations for this geometry are solved analytically, and a simple expression for the impedance is obtained. The inductance at low frequencies is practically unchanged compared to the case where the magnetic film is insulated from the conductor. However, the maximum achievable quality factor is found to be higher than that for the insulated case, even when a significant portion of the driving current flows through the magnetic film. Magnetic film inductors without insulation layers are simple in fabrication and promise large technological advantages.

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