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The design of an integrated thin-film inductor suitable for use at 10 MHz is described, and some operational characteristics are given. The inductor has the shape of a square spiral and is surrounded by permalloy thin films according to a certain pattern. This pattern allows these films to be driven in the hard direction and thus utilises the hard-direction permeability which is quite large (≃2700).
Saleh et al. (1970) studied this question.