The Effect of Conducting Substrates on the Switching of Ferromagnetic Thin Films†

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Abstract
The use of conducting substrates in a ferromagnetic thin film computer store alters the switching behaviour of storage elements. The effect of the conducting substrate can be calculated by solving the equation for the diffusion of eddy currents into the substrate. The solution is outlined for the case of a drive field due to a current in a strip line conductor, and for the case of a stray field duo to an inhomogeneous distribution of magnetization in the thin film. Values of field are enumerated by approximation for the former case. For fast switching the effect of the conducting substrate is to double all tangential fields and this gives rise to an increase of the apparent value of the anisotropy field, H k . This effect is demonstrated by an experiment where the storage element configurations, corresponding to conducting and non-conducting substrates, respectively, are compared directly.

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