Stoichiometry dependent phase transition in Mn-Co-Ga-based thin films: From cubic in-plane, soft magnetized to tetragonal perpendicular, hard magnetized

Siham Ouardi, Takahide Kubota, Gerhard H. Fecher, Rolf Stinshoff, Shigemi Mizukami, Terunobu Miyazaki, Eiji Ikenaga, Claudia Felser

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

Epitaxial thin films of Mn3-x Cox Ga were grown on MgO by magnetron co-sputtering with different Co content. Dependent on the Co content tetragonal or cubic structures are obtained. The composition dependence of saturation magnetization MS and uniaxial magnetic anisotropy Ku in the epitaxial films were investigated. A high magnetic anisotropy Ku of 1.2 MJ m-3 was achieved for the Mn 2.6Co0.3Ga1.1 film with low magnetic moment of 0.84 μB. The valence band spectra of the films were investigated mainly by hard x-ray photoelectron spectroscopy. The evidence of sharp states in the cubic case, which are smeared out in the tetragonal case, proof the existence of a van Hove singularity that causes a band Jahn-Teller effect accompanied by a tetragonal distortion. These differences are in well agreement to the ab-initio calculations of the electronic structure.

Original languageEnglish
Article number242406
JournalApplied Physics Letters
Volume101
Issue number24
DOIs
Publication statusPublished - 2012 Dec 10

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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