Perpendicularly magnetized Mn-Co-Ga-based thin films with high coercive field

Abstract

Mn${}_{3-x}$Co${}_x$Ga epitaxial thin films were grown on MgO substrates by magnetron co-sputtering. Structures were tetragonal or cubic depending on Co content. Composition dependence of saturation magnetization and uniaxial magnetic anisotropy $K_u$ of the films were investigated. A high $K_u$ (1.2 MJ m${}^{-3}$) was achieved for the Mn${}_{2.6}$Co${}_{0.3}$Ga${}_{1.1}$ film with the magnetic moment 0.84${\mu }_B$. Valence band spectra were obtained by hard X-ray photoelectron spectroscopy. Sharp peaks in the cubic case, which were absent in the tetragonal case, prove that a van Hove singularity causes a band Jahn-Teller effect with tetragonal distortion. Observations agree well with the first-principles calculations.

References in corpus (1)

• High energy, high resolution photoelectron spectroscopy of Co2Mn(1-x)Fe(x)Si

Cited by in corpus (10)

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• Disorder-induced cubic phase in Fe${}_2$-based Heusler alloys
• Magnetic and transport properties of tetragonal- or cubic-Heusler-type Co-substituted Mn-Ga epitaxial thin films
• Direct measurement of the magnetic anisotropy field in Mn--Ga and Mn--Co--Ga Heusler films
• Structure, site-specific magnetism and magneto-transport properties of epitaxial D0${}_{22}$ Mn${}_2$Fe${}_x$Ga thin films
• Heteroepitaxial growth of tetragonal Mn${}_{2.7-x}$Fe${}_x$Ga${}_{1.3}$ (0 $⩽$ x $⩽$ 1.2) Heusler films with perpendicular magnetic anisotropy
• Magnetic dichroism study on Mn${}_{1.8}$Co${}_{1.2}$Ga thin film using a combination of X-ray absorption and photoemission spectroscopy