Abstract
Since La0.75Ce0.25(Fe0.85Mn0.03Si0.12)13 itinerant-electron metamagnet exhibits large magnetocaloric effects at low temperatures because of the itinerant-electron metamagnetic (IEM) transition, the reduction of hysteresis loss Eh estimated from the enclosed area between the ascendant and descendant magnetization has been investigated. We have found that Eh associated with the IEM transition of La0.75Ce0.25(Fe0.85Mn0.03Si0.12)13 is remarkably reduced from 78 to 3 J/kg by a slight adjustment of compositions, that is, the increase of the Ce concentration up to z=0.35 and the decrease of the Fe concentration down to x=0.84. What is important is that such improvement is achieved without a striking decrease of the isothermal magnetic entropy change ΔSm at low temperatures.
