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

In this study, X-ray absorption spectroscopy (XAS) experiments for Ni45Co5Mn36.7In13.3 metamagnetic shape memory alloy were performed under high magnetic fields up to 12 T using a pulsed magnet. Field–induced reverse transformation from martensite phase austenite caused considerable changes in the circular dichroism (MCD) signals and moments of Mn, Ni, Co with ferromagnetic coupling determined. The spin moment, Mspin, orbital Morb, Mn atom induced phase, estimated based on sum-rule analysis, 3.19 0.08 ?B, respectively, resulting an Morb / Mspin ratio 0.03. element-specific magnetization curves obtained at 150 K, behavior associated field–induced was clearly observed could be detected. There almost no change magnetically averaged XAS spectrum Mn-L2,3 edges between field-induced phases, however, it visible Ni. This implies that Ni 3d-electrons mainly contribute martensitic transformation.