Magnetic and transport properties of tetragonal- or cubic-Heusler-type Co-substituted Mn-Ga epitaxial thin films

Abstract

The composition dependence of the structural, magnetic, and transport properties of epitaxially grown Mn-Co-Ga films were investigated. The crystal structure was observed to change from tetragonal to cubic as the Co content was increased. In terms of the dependence of saturation magnetization on the Co content, relatively small value was obtained for the Mn${}_{2.3}$Co${}_{0.4}$Ga${}_{1.3}$ film at a large {\it K}${}_{\text{u}}$ value of 9.2 Merg/cm${}^3$. Electrical resistivity of Mn-Co-Ga films was larger than that of pure Mn-Ga film. The maximum value of the resistivity was 490 $\mu \Omega$cm for Mn${}_{2.2}$Co${}_{0.6}$Ga${}_{1.2}$ film. The high resistivity of Mn-Co-Ga might be due to the presence of localized electron states in the films due to chemical disordering caused by the Co substitution.

3 pages, 5 figures. The article has been submitted to the Journal of Applied Physics as a Proceedings for the 12th Joint MMM/INTERMAG conference

References in corpus (1)

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

Cited by in corpus (5)

• Magnetism in tetragonal manganese-rich Heusler compounds
• Loss of anisotropy in strained ultrathin epitaxial L10 Mn-Ga films
• Direct measurement of the magnetic anisotropy field in Mn--Ga and Mn--Co--Ga Heusler 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