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Large thermal hysteresis in the MnFe(P, Si, B) system hinders the heatexchange rate and thus limits the magnetocaloric applications at highfrequencies. Substitution of Mn by V in Mn1-xVxFe0.95P0.593Si0.33B0.077 andMn1-xVxFe0.95P0.563Si0.36B0.077 alloys was found to reduce the thermalhysteresis due to a decrease in the latent heat. Introducing V increases boththe field-induced transition temperature shift and the magnetic moment performula unit. Thus, a decease in the thermal hysteresis is obtained withoutlosing the giant magnetocaloric effect. In consequence, an ultralow hysteresis(0.7 K) and a giant adiabatic temperature change of 2.3 K were achieved, whichmakes these alloys promising candidates for commercial magnetic refrigeratorusing permanent magnets.

Ultra-low Hysteresis in Giant Magnetocaloric Mn1-xVxFe(P,Si,B) Compounds