Abstract
In this work, we studied the phase transitions and exchange bias of Ni50−xMn36Sn14Tx (T = Pd, Pt; x = 0, 1, 2, 3) alloys. An intermartensitic transition (IMT), not observed in Ni50Mn36Sn14 alloy, was induced by the proper application of negative chemical pressure by Pd(Pt) doping in Ni50−xMn36Sn14Tx (T = Pd, Pt) alloys. IMT weakened and was suppressed with the increase of applied field; it also disappeared with further increase of Pd(Pt) content (x = 3 for Pd and x = 2 for Pt). Another striking result is that exchange bias effect, ascribed to the percolating ferromagnetic domains coexisting with spin glass phase, is notably enhanced by nonmagnetic Pd(Pt) addition. The increase of unidirectional anisotropy by the addition of Pd(Pt) impurities with strong spin-orbit coupling was explained by Dzyaloshinsky-Moriya interactions in spin glass phase.
Highlights
Ni-Mn-X (X =In, Sn, Sb) ferromagnetic shape memory alloys (FSMAs), first reported by Sutou et al in 20041, have become an active field of research because of the great richness of physics as well as their potential applications in magnetic refrigerator, sensor, and actuator
All these data were recorded upon zero field cooling (ZFC), field Cooling (FC), and field warming (FW) with an applied field of 100
All samples exhibit the shift of Mn-X alloys are characterized (Ms)-H loops to the negative field direction, i.e. exchange bias (EB) effect, which has been observed in Ni-Mn-X (X =In, Sn, Sb) alloys and can be ascribed to the coexistence and competition of FM and AFM interaction at low temperature[25,26,33]
Summary
Ni-Mn-X (X =In, Sn, Sb) ferromagnetic shape memory alloys (FSMAs), first reported by Sutou et al in 20041, have become an active field of research because of the great richness of physics as well as their potential applications in magnetic refrigerator, sensor, and actuator. Ni50−xMn36Sn14Tx (T =Pd, Pt) alloys, which will be further discussed in the composition dependence of magnetization at low temperature.
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