L10-ordered high coercivity (FePt)Ag-C granular thin films for perpendicular recording |
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Authors: | Li Zhang |
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Institution: | Magnetic Materials Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan |
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Abstract: | We report (FePt)Ag-C granular thin films for potential applications to ultrahigh density perpendicular recording media, that were processed by co-sputtering FePt, Ag, and C targets on MgO underlayer deposited on thermally oxidized Si substrates. (FePt)1−xAgx-yvol%C (0<x<0.2, 0<y<50) films were fabricated on oxidized silicon substrates with a 10 nm MgO interlayer at 450oC. We found that the Ag additions improved the L10 ordering and the granular structure of the FePt-C films with the perpendicular coercivity ranging from 26 to 37 kOe for the particle size of 5-8 nm. The (FePt)0.9Ag0.1-50vol%C film showed the optimal magnetic properties as well as an appropriate granular morphology for recording media, i.e., average grain size of Dav=6.1 nm with the standard deviation of 1.8 nm. |
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Keywords: | FePt granular thin film L10 ordering Magnetic perpendicular recording media |
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