Field dependence of magnetic entropy change and estimation of spontaneous magnetization in Cd substituted MnCoGe

Abstract MnCoGe-based alloys have recently attracted much attention due to their possible large magnetocaloric effect related to the magnetostructural coupling. In this paper, we report a comprehensive study of the spontaneous magnetization and magnetic entropy change of MnCo 1- x Cd x Ge ( x  = 0.04 and x  = 0.06) alloys for magnetization and demagnetization modes. Landau theory and the dispersion width of the vertical spread of normalized magnetic entropy curves are performed to confirm the second-order transition in this series, consistent with the Banerjee criterion. The maximum isothermal entropy change is presented to depend on magnetic field as follows: |Δ S Max | =  A ( H  +  H 0 ) 2/3 – AH 0 2/3 + BH 4/3 . Here A and B are the intrinsic parameters, and H 0 is a measure of homogeneity. Moreover, we verify the validity and usefulness of magnetic entropy change to estimate the spontaneous magnetization in this system. Finally, these new findings and related discussions with negligible hysteretic losses contribute to the research on the magnetic properties and magnetocaloric potentials in thermomagnetic applications.