Abstract
The ac current distribution in a long thin conductor sheet has been investigated as a first step to understand the frequency dependence of the scaled model for magnetic bubble domain conductor-sheet devices. The current distribution in a conductor sheet without apertures has been estimated experimentally by using a search coil which picks up the planar component of the magnetic field just above the sheet surface. A simple iteration approach has been proposed to calculate the current density by successive approximation method, and the computational results in good agreement with the experiment have been obtained. The current density at the edge portions of the conductor sheet has been shown to increase considerably at a frequency as low as a few kHz depending on the sheet width ω and sheet thickness t. A formula has been derived indicating an upperbound frequency fc above which the so-called eddy-current effect cannot be neglected: fc[MHz] = 1.15p [μΩ · cm]/(ω [cm] t [μm]). The principle of the calculation and the salient computational results are given.
