Abstract
Ni[Formula: see text]CoxMn[Formula: see text]Ga[Formula: see text] ([Formula: see text]) alloys undergo martensitic transformation between ferromagnetic (FM) austenite and weak-magnetic martensite. However, the type of magnetism of martensite remains unclear. In this work, the results of a detailed study of the magnetic state of martensite in a Ni[Formula: see text]Co7Mn[Formula: see text]Ga[Formula: see text] are shown. The evolution with post-quench ageing indicates that improvement of atomic order increases the FM contributions to the weak-magnetic martensite, major changes occurring as the austenite switches from paramagnetic (PM) to FM. The results are consistent with the presence of FM clusters inside a PM matrix.
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