Engineered heusler ferrimagnets with a large perpendicular magnetic anisotropy

Reza Ranjbar, Kazuya Suzuki, Atsushi Sugihara, Terunobu Miyazaki, Yasuo Ando, Shigemi Mizukami

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Synthetic perpendicular magnetic anisotropy (PMA) ferrimagnets consisting of 30-nm-thick D022-MnGa and Co2MnSi (CMS) cubic Heusler alloys with different thicknesses of 1, 3, 5, 10 and 20 nm, buffered and capped with a Cr film, are successfully grown epitaxially on MgO substrate. Two series samples with and without post annealing at 400 �C are fabricated. The (002) peak of the cubic L21 structure of CMS films on the MnGa layer is observed, even for the 3-nm-thick CMS film for both un-annealed and annealed samples. The smaller remnant magnetization and larger switching field values of CMS (1-20 nm)/MnGa (30 nm) bilayers compared with 30-nm-thick MnGa indicates antiferromagnetic (AFM) interfacial exchange coupling (Jex) between MnGa and CMS films for both un-annealed and annealed samples. The critical thickness of the CMS film for observing PMA with AFM coupling in the CMS/MnGa bilayer is less than 10 nm, which is relatively large compared to previous studies.

Original languageEnglish
Pages (from-to)6531-6542
Number of pages12
JournalMaterials
Volume8
Issue number9
DOIs
Publication statusPublished - 2015

Keywords

  • CoMnSi cubic Heusler alloy
  • Epitaxial film
  • MnGa
  • Synthetic PMA ferrimagnets

ASJC Scopus subject areas

  • Materials Science(all)

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