Effect of iron and cobalt addition on magnetic and shape memory properties of Ni2MnGa sputtered films

The effect of iron and cobalt addition on the magnetic and shape memory properties of Ni2MnGa sputtered films was investigated. It was found that heat-treated films with more than 5.1 mol% Co have two phases. Martensitic transformation temperatures of the constraint-aged films decreased with the iron addition and increased with increasing cobalt content. The Curie temperature of the heat-treated films increased with increasing amount of iron or cobalt. The constraint-aged films containing iron and cobalt exhibited a two-way shape memory effect by heating and cooling.