The magnetic properties of the FePt thin films with a Ag top layer prepared by magnetron sputtering have been studied. With 4nm Ag layer deposited right after the deposition of FePt layer, the ordering temperature of the L10 FePt phase decreased to 350°C or below. X-ray photoelectron spectroscopy results indicate that Ag has diffused into the FePt layer when Ag was deposited at 350°C, while Ag remains on the top of the FePt when Ag was deposited at room temperature. The Ag top layer deposited at 350°C was also found to protect the FePt layer from oxidation.
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Zhao et al. (2005) studied this question.
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