Magnetocrystalline anisotropy and volume ratio of FePt grains with c-axes parallel to the film plane in FePt granular film with various grain boundary materials

Takashi Saito, Kim Kong Tham, Ryosuke Kushibiki, Tomoyuki Ogawa, Shin Saito

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, we analyzed the structure for FePt grains whose c-axes are parallel to the film plane (in-plane grains) and the effect of the grains on magnetic properties. According to the analysis for granular films with a constant GBM volume of 30 vol% deposited at a high substrate temperature, the structure such as the lattice constant c, a and degree of order for in-plane grains was estimated to be the same as that of FePt grains whose c-axes are normal to the film plane (normal grains). In addition, it was found that perpendicular magnetic anisotropy was dependent on both the ratio of in-plane grains to the normal grains (Rparallel) and the degree of order. Considering Rparallel and the volume of GBM, magnetocrystalline anisotropy (Kugrain) is estimated to be 3.43 × 107 (erg cm−3) for perfect ordering FePt grains.

Original languageEnglish
Article number075505
JournalJapanese journal of applied physics
Volume60
Issue number7
DOIs
Publication statusPublished - 2021 Jul

ASJC Scopus subject areas

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

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