Ab initio study of magnetic properties of Ni-Mn-Ga Heusler alloys

摘要

In this work the magnetic properties (exchange parameters, magnetic moment) of non-stoichiometric Ni-Mn-Ga Heusler alloys with structural disorder by the help of ab initio calculations have been performed. Theoretical composition dependences of the total magnetic moment are in qualitative agreement with experimental data. Calculations of exchange parameters show that interactions between the Mn atoms in regular positions and Mn atoms in Ni and Ga positions are antiferromagnetic.