The role of Zr and B in room temperature magnetic entropy change of FeZrB amorphous alloys

Effect of Zr and B on magnetocaloric effect for Fe90−xZr10Bx (x:3∼9) and Fe93−xZr7Bx (x:0∼13) amorphous alloys is presented. A clear dependence of peak magnetic entropy change (|ΔSmpk|) on (Zr+B) total contents rather than respective contents is observed and found to be correlated with average magnetic moment per Fe atom. Temperature of |ΔSmpk| corresponding to Curie temperature (Tc) is dependent on B contents, which is discussed in terms of exchange coupling. These findings exhibit in general the importance of Zr and B in seeking for an optimal |ΔSmpk| and meanwhile tunable Tc in Fe-based amorphous alloys.