Reduction of hysteresis loss and large magnetocaloric effects in substituted compounds of itinerant-electron metamagnets La(Fe x Si1− x )13

Abstract: The maximum value of hysteresis loss E h MAX due to the itinerant-electron metamagnetic (IEM) transition of La(Fe x Si1− x )13 and the partially substituted compounds La1− z Ce z (Fe0.86Si0.14)13 and La1− z ′Pr z ′(Fe0.86Si0.14)13 increases when the magnetocaloric effects (MCEs) become large. It should be noted that the reduction of E h MAX without the decrease of large MCEs is achieved in La1− z Ce z (Fe0.86Si0.14)13 and La1− z ′Pr z ′(Fe0.86Si0.14)13. For both the compound systems mentioned above, the critical temperature T 0 for the IEM transition decreases and the difference between T 0 and the Curie temperature T C becomes larger with decreasing T C. These results are consistent with the magnetic phase diagram of La(Fe0.86Si0.14)13 under hydrostatic pressure. Consequently, the reduction of E h MAX in La1− z Ce z (Fe0.86Si0.14)13 and La1− z ′Pr z ′(Fe0.86Si0.14)13 is closely related with the magnetovolume effects. [Copyright &y& Elsevier]