Comparative study of structural and magnetic properties of ribbon and bulk Ni55Fe19Ga26 Heusler alloy

The influence of the fabrication method on magnetostructural properties a Ni55Fe19Ga26 Heusler alloy, obtained both as ribbon, by melt-spinning, and pellet, arc-melting, has been analyzed. It found that, while arc-melting technique leads to precipitation gamma phase non-modulated martensite structure, alloy prepared melt-spinning presents fully 14M modulated martensitic structure at room temperature. tetragonal in arc-melted bulk sample transforms into after long thermal treatment (at 1073 K for 24 h) subsequent quenching. Characteristic temperatures transformation are higher melt-spun ribbons than sample, due consequent different composition. However, temperature is practically constant case it changes ~ 150 ribbon submitted same applied samples. Finally, was that occurs paramagnetic regime types