Influence of chemical ordering on magnetocrystalline anisotropy and magnetoelastic properties in Weyl magnetic semimetal Co2MnGa thin films

The magnetic anisotropy and magnetoelastic properties of the magnetic Weyl semimetal Co 2 MnGa were investigated in the Co 2 MnGa thin films with different chemical orderings. Their properties change, in line with the increase in the contents of the highly-ordered B2 and L2 1 phases. The most significant changes of both the magnetic anisotropy and the magnetoelastic properties were correlated with the appearance of the L2 1 ordered phase of Heusler alloy, which is also responsible for topological properties of these compounds. The magnetoelastic properties of L2 1 ordered Co 2 MnGa are discussed in comparison with the Co 2 Fe x Mn 1-x Si system with a similar degree of ordering, which has similar crystallographic structure but it is not Weyl semimetal. In particular, significant differences between the magnetoelastic properties of ordered Co 2 MnGa and Co 2 MnSi were found. In the case of L2 1 -ordered Co 2 MnGa, the giant anisotropy of the magnetoelastic properties was observed.