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

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5 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 languageEnglish
Pages (from-to)1-5
Number of pages5
JournalScripta Materialia
Volume157
DOIs
Publication statusPublished - 2018 Dec
Externally publishedYes

Keywords

  • Coercivity
  • FePt
  • Magnetic recording
  • Microstructure
  • Underlayer

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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    Sepehri-Amin, H., Nagano, M., Seki, T., Ho, H., Tripathy, D., Pirzada, S., Srinivasan, K., Yuan, H., Dorsey, P., Ajan, A., & Hono, K. (2018). Microstructure and magnetic properties of FePt-(C,SiO2) granular films deposited on MgO, MgTiO, and MgTiON underlayers. Scripta Materialia, 157, 1-5. https://doi.org/10.1016/j.scriptamat.2018.07.025