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

doi:10.1063/1.4880655

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 journal › Article › peer-review

35 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 language	English
Article number	222403
Journal	Applied Physics Letters
Volume	104
Issue number	22
DOIs	https://doi.org/10.1063/1.4880655
Publication status	Published - 2014 Jun 2

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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.",

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AU - Varaprasad, B. S.D.Ch S.

AU - Takahashi, Y. K.

AU - Wang, J.

AU - Ina, T.

AU - Nakamura, T.

AU - Ueno, W.

AU - Nitta, K.

AU - Uruga, T.

AU - Hono, K.

PY - 2014/6/2

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AB - 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.

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

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