Tuning the structural, magnetic, and transport properties of Mn3Ga alloys
Linxuan Song, Weike Li, Senhao Lv, Xuekui Xi, Dongliang Zhao, Jun He, Wenhong Wang
Abstract
Mn3Ga alloys with different crystal modifications, including a disordered L12-type cubic structure, a D022-tetragonal structure, and a D019-hexagonal structure showing two isomorphic heteromagnetic phases, ε-phase and η-phase, were investigated systematically. We found that the disordered cubic phase and the hexagonal ε-phase can be synthesized with Mn compositions ranging from 70 to 75 at. % by rapid melt-spinning. Moreover, the disordered cubic phase could transform to the tetragonal phase after being subjected to low-temperature postannealing. Most importantly, we found that proper postannealing conditions can enable these different crystal modification phases to transform to the hexagonal η-phase. As a result, the two isomorphic heteromagnetic hexagonal phases are clearly distinguished, and their interesting magnetic and transport properties are discussed.