In order to investigate the Fe substituted effects on the magnetic properties of the Ni-Mn-Sn metamagnetic shape memory alloys, magnetization and the M？ssbauer spectroscopy measurements were carried out with using 57Fe-doped specimens of Ni 2Mn 1.48？x 57Fe xSn 0.52 ( x = 0.02, 0.04 and 0.08). Singlet-type M？ssbauer spectra were clearly observed for x = 0.02 and 0.04 just below the martensitic transformation temperature, T M, and above the Curie temperature, T C, in the austenite phase. It was clear that the magnetic state in the martensite phase just below T M was paramagnetic for x = 0.02 and 0.04. In further doped 57Fe to Ni 2Mn 1.48Sn 0.52, T C in the austenite phase slightly increased. However, the value of T M significantly decreased. As a result, martensite phase with small spontaneous magnetization directly transformed to the ferromagnetic austenite phase during heating for x = 0.08. These results obtained from the M？ssbauer spectra were consistent with the results of the magnetic measurements in this study and the phase diagram reported by Fukushima et al. for normal Fe-doped Ni 2Mn 1.48？xFe xSn 0.52 alloys. The breakdown of the general rule, in which the ferromagnetic shape memory alloys with larger value of the valence electrons per atom, e/ a, showed higher T M, was also appeared in Ni 2Mn 1.48？xFe xSn 0.52 alloys, being similar to Ni 2Mn 1？xFe xGa alloys.
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