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

B. S.D.Ch S. Varaprasad, Y. K. Takahashi*, J. Wang, T. Ina, T. Nakamura, W. Ueno, K. Nitta, T. Uruga, K. Hono

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

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 L10-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 L10-order in the FePt grains.

Original languageEnglish
Article number222403
JournalApplied Physics Letters
Volume104
Issue number22
DOIs
Publication statusPublished - 2014 Jun 2
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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