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

Research output: Contribution to journalArticlepeer-review

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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