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Abstract
Abstract We have investigated the martensitic transformation, exchange bias, magnetoresistance (MR) and strain in Ni 50− x Fe x Mn 36 Sn 14 ( x =1, 2, 3, 4) Heusler alloys. With the increase of Fe content, the austenite phase could be stabilized with L 2 1 structure and hence the martensitic transition shifts to a lower temperature and finally disappears. This behavior can be understood by the weakening of Ni–Mn hybridization to suppress AFM interactions and enhancement of Fe–Fe ferromagnetic exchange interactions. The same reason can account for the slight decrease of exchange bias field ( H EB ) with the increase of the Fe content from x =1 to 2 and the disappearance of H EB for x =3. We observed MR effect for x =3, and a maximum MR value of −52% was achieved, which can be explained by the change in the electronic structure during martensitic transformation induced by the magnetic field. In addition, a large strain of 0.207% in Ni 49 Fe 1 Mn 36 Sn 14 was observed due to the changes of lattice parameters during the martensitic transformation induced by temperature.
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