Formation and Perpendicular Magnetic Coupling of A1 and L1₀ CoPt in CoPt/TiN Films on Glass Substrate

Hongyu An, Kazuya Ando, Yoshio Nakamura, Ji Shi

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Abstract

We have studied the structure and the magnetic properties of CoPt films by using TiN spacer layer deposited on a glass substrate. We show that after annealing at 700 °C, a highly (001)-textured L1₀ CoPt structure has been successfully obtained. However, by increasing the annealing temperature to 800 °C, two magnetic phases A1 CoPt and L1₀ CoPt are formed despite of the better crystallinity of CoPt than that annealed at 700 °C. By measuring the minor magnetic hysteresis loops of the samples after applying a field cooling in a range from room temperature to 500 °C, we have further studied the magnetic coupling between A1 and L1₀ CoPt phases in the out-of-plane direction of the films. Our work may provide a piece of information for other studies on the heat-assisted magnetic recording.

Original languageEnglish
JournalIEEE Transactions on Magnetics
DOIs
Publication statusAccepted/In press - 2018 Aug 18

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Keywords

  • Heat-assisted magnetic recording (HAMR)
  • L1₀ CoPt
  • perpendicular magnetic anisotropy (PMA)
  • TiN

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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