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Grain-type alloy thin films consisting of fine ferromagnetic grains, which are composed of Fe, Co, Ni, or their alloys, in non-magnetic Ag, Bi, or Mg matrices were prepared by a vacuum deposition method. Structural, magnetic, and magnetoresistance characteristics were studied on such films as a function of the composition and concentration. A giant magnetoresistance GMR effect was observed over a broad range of magnetic concentrations in the Ag-based systems, except the Ni-Ag one, at room temperature. The appearance of the GMR effect is probably correlated with the Curie temperature of the magnetic component and the atomic radius ratio of the magnetic and non-magnetic components.
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Maeda et al. (1993) studied this question.
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