Microstructure and magnetic properties of FePt-(C,SiO2) granular films deposited on MgO, MgTiO, and MgTiON underlayers

H. Sepehri-Amin; Miho Nagano; T. Seki; H. Ho; D. Tripathy; S. Pirzada; K. Srinivasan; H. Yuan; P. Dorsey; A. Ajan; K. Hono

doi:10.1016/j.scriptamat.2018.07.025

Microstructure and magnetic properties of FePt-(C,SiO₂) granular films deposited on MgO, MgTiO, and MgTiON underlayers

H. Sepehri-Amin, Miho Nagano, T. Seki, H. Ho, D. Tripathy, S. Pirzada, K. Srinivasan, H. Yuan, P. Dorsey, A. Ajan, K. Hono

International Center for Synchrotron Radiation Innovation Smart (SRIS)

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

We investigated the microstructure and magnetic properties of FePt-(C,SiO₂) granular films deposited on MgO, MgTiO, and MgTiON underlayers. The coercivity and grain size of the FePt-(C,SiO₂) film are substantially degraded when deposited on the MgTiO underlayer compared to those on the MgO underlayer, while they become comparable when deposited on the MgTiON underlayer. Atomic resolution STEM-EDS showed Ti in the MgTiO underlayer diffuses into FePt grains, while it is suppressed using the MgTiON underlayer. This suggests that MgTiON is a good choice for a conductive underlayer for growing L1₀-FePt perpendicular recording media for heat assisted magnetic recording.

Original language	English
Pages (from-to)	1-5
Number of pages	5
Journal	Scripta Materialia
Volume	157
DOIs	https://doi.org/10.1016/j.scriptamat.2018.07.025
Publication status	Published - 2018 Dec

Keywords

Coercivity
FePt
Magnetic recording
Microstructure
Underlayer

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10.1016/j.scriptamat.2018.07.025

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title = "Microstructure and magnetic properties of FePt-(C,SiO2) granular films deposited on MgO, MgTiO, and MgTiON underlayers",

abstract = "We investigated the microstructure and magnetic properties of FePt-(C,SiO2) granular films deposited on MgO, MgTiO, and MgTiON underlayers. The coercivity and grain size of the FePt-(C,SiO2) film are substantially degraded when deposited on the MgTiO underlayer compared to those on the MgO underlayer, while they become comparable when deposited on the MgTiON underlayer. Atomic resolution STEM-EDS showed Ti in the MgTiO underlayer diffuses into FePt grains, while it is suppressed using the MgTiON underlayer. This suggests that MgTiON is a good choice for a conductive underlayer for growing L10-FePt perpendicular recording media for heat assisted magnetic recording.",

keywords = "Coercivity, FePt, Magnetic recording, Microstructure, Underlayer",

author = "H. Sepehri-Amin and Miho Nagano and T. Seki and H. Ho and D. Tripathy and S. Pirzada and K. Srinivasan and H. Yuan and P. Dorsey and A. Ajan and K. Hono",

note = "Funding Information: This work was in part supported by ASTC -IDEMA. Publisher Copyright: {\textcopyright} 2018 Acta Materialia Inc.",

year = "2018",

month = dec,

doi = "10.1016/j.scriptamat.2018.07.025",

language = "English",

volume = "157",

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journal = "Scripta Materialia",

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T1 - Microstructure and magnetic properties of FePt-(C,SiO2) granular films deposited on MgO, MgTiO, and MgTiON underlayers

AU - Sepehri-Amin, H.

AU - Nagano, Miho

AU - Seki, T.

AU - Ho, H.

AU - Tripathy, D.

AU - Pirzada, S.

AU - Srinivasan, K.

AU - Yuan, H.

AU - Dorsey, P.

AU - Ajan, A.

AU - Hono, K.

PY - 2018/12

Y1 - 2018/12

N2 - We investigated the microstructure and magnetic properties of FePt-(C,SiO2) granular films deposited on MgO, MgTiO, and MgTiON underlayers. The coercivity and grain size of the FePt-(C,SiO2) film are substantially degraded when deposited on the MgTiO underlayer compared to those on the MgO underlayer, while they become comparable when deposited on the MgTiON underlayer. Atomic resolution STEM-EDS showed Ti in the MgTiO underlayer diffuses into FePt grains, while it is suppressed using the MgTiON underlayer. This suggests that MgTiON is a good choice for a conductive underlayer for growing L10-FePt perpendicular recording media for heat assisted magnetic recording.

AB - We investigated the microstructure and magnetic properties of FePt-(C,SiO2) granular films deposited on MgO, MgTiO, and MgTiON underlayers. The coercivity and grain size of the FePt-(C,SiO2) film are substantially degraded when deposited on the MgTiO underlayer compared to those on the MgO underlayer, while they become comparable when deposited on the MgTiON underlayer. Atomic resolution STEM-EDS showed Ti in the MgTiO underlayer diffuses into FePt grains, while it is suppressed using the MgTiON underlayer. This suggests that MgTiON is a good choice for a conductive underlayer for growing L10-FePt perpendicular recording media for heat assisted magnetic recording.

KW - Coercivity

KW - FePt

KW - Magnetic recording

KW - Microstructure

KW - Underlayer

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DO - 10.1016/j.scriptamat.2018.07.025

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JO - Scripta Materialia

JF - Scripta Materialia

ER -

Microstructure and magnetic properties of FePt-(C,SiO₂) granular films deposited on MgO, MgTiO, and MgTiON underlayers

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Keywords

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