Abstract
Ni50−xCoxMn30Ga20 (x = 6–9) alloys show metamagnetic behaviour, undergoing martensitic transformation (MT) between ferromagnetic austenite and weak magnetic martensite. The temperatures of the structural and magnetic transitions depend on composition and L21 order degree, in such a way that combined composition and thermal treatment allows for MT between any magnetic state of austenite and martensite. For these alloys, mutual influence between atomic and magnetic order has been widely studied. However, the type of magnetism of martensite remains unclear. In this work, the magnetic state of martensite in a Ni43Co7Mn30Ga20 alloy has been studied in detail. Its evolution as a function of post-quench ageing time indicates that improved atomic order enhances the ferromagnetic character of the weakly magnetic martensite. The most important changes occur when austenite switches from paramagnetic to ferromagnetic. The magnetic behavior of martensite is consistent with the presence of ferromagnetic clusters inside a paramagnetic matrix.
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