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In this study, X-ray absorption spectroscopy (XAS) experiments forNi45Co5Mn36.7In13.3 metamagnetic shape memory alloy were performed under highmagnetic fields up to 12 T using a pulsed magnet. Field-induced reversetransformation to austenite phase caused considerable changes in the magneticcircular dichroism (MCD) signals and the magnetic moments of the ferromagneticcoupling between Mn, Ni, and Co were determined. The spin magnetic moment,Mspin, and orbital magnetic moment, Morb, of Mn atom in the induced austeniteferromagnetic phase, estimated based on the magneto-optical sum rule, were 3.2and 0.13 {\mu}B, respectively, resulting in an Morb / Mspin ratio of 0.04. Inthe element-specific magnetization curves recorded at 150 K, metamagneticbehavior associated with the field-induced reverse transformation is clearlyobserved and reverse transformation finishing magnetic field and martensitictransformation starting magnetic field are detected. There was almost nodifference in the magnetically averaged XAS spectrum for Mn-L2,3 edges betweenin the martensite and in the magnetic field-induced austenite phases, however,it was visible for Ni, indicating that Ni 3d-electrons mainly contribute tomartensitic transformation.

Soft X-ray absorption spectroscopy and magnetic circular dichroism under pulsed high magnetic field of Ni-Co-Mn-In metamagnetic shape memory alloy