Abstract
This paper investigates the influence of Co and Al concentrations on the structure, magnetic properties and magnetocaloric effect of (Ni, Co)-Mn-(Sn, Al) alloy ribbons prepared by melt-spinning. X-ray diffraction analyses show multi-crystalline phase characteristic of the ribbons including face-centered cubic (L10), body-centered cubic (B2), orthorhombic (4O) and monoclinic (10M) phases. The amplitude and temperature of the martensite–austenite phase transition of the alloy clearly depend on Co and Al concentrations. Magnetization measurements reveal soft magnetic features, with coercivity less than 50 Oe for all the alloy ribbons. The Curie temperature of the austenite phase increases with increasing Co concentration, but decreases with increasing Al concentration. The magnetic phase transitions in the alloy can be shifted to the room temperature region by adjusting the Co and Al concentrations. With appropriate concentrations of Co and Al, the alloy ribbons possess both negative and positive magnetocaloric effects, with a maximum magnetic entropy change larger than 0.6 J kg−1 K−1 in a magnetic field change of 12 kOe. The temperature and magnetic field dependence of the magnetocaloric effect in these alloy ribbons was also investigated.
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