Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 322, Issue 18, Pages 2658-2664Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2010.04.003
Keywords
FePt granular thin film; L1(0) ordering; Magnetic perpendicular recording media
Funding
- World Premier International Research Center Initiative (WPI Initiative) on Materials Nanoarchitronics, MEXT, Japan
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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-x)Ag-x-yvol%C (0 < x < 0.2, 0 < y < 50) films were fabricated on oxidized silicon substrates with a 10 nm MgO interlayer at 450 degrees C. We found that the Ag additions improved the L1(0) 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)(0.9)Ag-0.1-50vol%C film showed the optimal magnetic properties as well as an appropriate granular morphology for recording media, i.e., average grain size of D-av=6.1 nm with the standard deviation of 1.8 nm. (C) 2010 Elsevier B.V. All rights reserved.
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