Mn 3 Ga , a compensated ferrimagnet with high Curie temperature and low magnetic moment for spin torque transfer applications

TLDR

This work reports on the electronic, magnetic, and structural properties of the binary compound Mn₃Ga. The tetragonal DO22 phase of Mn₃Ga was successfully synthesized and investigated. The material is a hard magnetic ferrimagnet with an energy product of 52.5 kJ m⁻³, a saturation magnetization of ~0.25 μB at indicating partially compensating Mn moments, a Curie temperature above 730 K, and a nearly half‑metallic electronic structure with 88 % spin polarization at the Fermi level.

Abstract

This work reports about the electronic, magnetic, and structural properties of the binary compound Mn3Ga. The tetragonal DO22 phase of Mn3Ga was successfully synthesized and investigated. It has been found that the material is hard magnetic with an energy product of Hc×Br=52.5kJm−3 and an average saturation magnetization of about 0.25μB∕at. at 5K. The saturation magnetization indicates a ferrimagnetic order with partially compensating moments at the Mn atoms on crystallographically different sites. The Curie temperature is above 730K where the onset of decomposition is observed. The electronic structure calculations indicate a nearly half-metallic ferrimagnetic order with 88% spin polarization at the Fermi energy.