Abstract
A unique time-dependent magnetotransport behavior has been observed in Fe–Bi films. Approximately one month was required to stabilize resistance after samples were fabricated. Initially, the as-prepared Fe–Bi films exhibit both ordinary magnetoresistance (MR) and anisotropic magnetoresistance. Fe precipitation changes the microstructure. Eventually, an isotropic and negative MR, like a giant MR effect was observed; it arises from electronic transport between Fe granules separated by Bi.
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