Novel torque magnetometry for uniaxial anisotropy constants of thin films and its application to FePt granular thin films

Takuya Ono, Nobuaki Kikuchi, Satoshi Okamoto, Osamu Kitakami, Takehito Shimatsu

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

A technique based on torque magnetometry is proposed for precise determination of the uniaxial magnetic anisotropy constant, Ku of perpendicularly magnetized thin films, in particular for Ku larger than 106 J/m3, by electrical detection of the anomalous Hall effect and exact determination of the magnetic field direction. This technique can measure the Ku value of several-nanometer-thick polycrystalline films. Further, the Ku value of FePt-C granular films, which are expected to be useful for high-density magnetic recording media, is evaluated. The intrinsic Ku value of 4-nm-thick FePt-C thin films fabricated at 450 °C is approximately 3 MJ/m3 for carbon contents up to 34 vol % C.

Original languageEnglish
Article number033002
JournalApplied Physics Express
Volume11
Issue number3
DOIs
Publication statusPublished - 2018 Mar

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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