Mechanism of coercivity enhancement by Ag addition in FePt-C granular films for heat assisted magnetic recording media

Journal Article · Mon Jun 02 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4880655· OSTI ID:22300103

Wang, J.; Hono, K. ^[1]; Ina, T.; Nakamura, T.; Ueno, W.; Nitta, K.; Uruga, T. ^[2]

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1. National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba 305-0047 (Japan)
2. Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), 1-1-1 Kouto, Sayo, Hyogo 679-5198 (Japan)

We investigated the Ag distribution in a FePtAg-C granular film that is under consideration for a heat assisted magnetic recording medium by aberration-corrected scanning transmission electron microscope-energy dispersive X-ray spectroscopy and X-ray absorption fine structure. Ag is rejected from the core of FePt grains during the deposition, forming Ag-enriched shell surrounding L1{sub 0}-ordered FePt grains. Since Ag has no solubility in both Fe and Pt, the rejection of Ag induces atomic diffusions thereby enhancing the kinetics of the L1{sub 0}-order in the FePt grains.

• OSTI ID: 22300103
• Journal Information: Applied Physics Letters, Vol. 104, Issue 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
CARBON
COERCIVE FORCE
DEPOSITION
DIFFUSION
DISTRIBUTION
FILMS
FINE STRUCTURE
GRANULAR MATERIALS
HEAT
IRON COMPOUNDS
PLATINUM COMPOUNDS
SILVER ADDITIONS
TRANSMISSION ELECTRON MICROSCOPY
X RADIATION
X-RAY SPECTROSCOPY