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(a) ZFC and FC magnetization curves of the Tb46Al24Co20Y10 BMG (inset: Gd51Al24Co20Zr4Nb1 BMG). (b) H-Tirr diagram for Tb-based BMG showing the irreversible and reversible regions. (c) Landau free energy vs. a phase-space coordinate of the SM state. During an irreversible process the system transfers to a neighboring local megabasin, and entropy is produced internally (SP > 0).
Typical isothermal magnetization curves of Tb46Al24Co20Y10 BMG well below (a) and well above (b) Tirr . (c) Isothermal magnetization plots of Gd51Al24Co20Zr4Nb1 BMG. (d)–(e) Heat capacity of Tb-based BMG under various fields from 0 to 7 T. (f) Heat capacity of Gd-based BMG.
Magnetic entropy changes of Tb46Al24Co20Y10 (a) and Gd51Al24Co20Zr4Nb1 (b) BMGs under a field change of 5 T obtained from the caloric and magnetic measurements. (c) Magnetic entropy changes of Tb-based BMG under field changes from 8000 Oe to 5 T calculated from Eqs. (5) and (10) , and the inset obtained from caloric measurements (8000 Oe to 7 T). (d) Schematic diagram of an initial M vs H plot in equilibrium state, showing the relationship between the magnetic entropy change and the Gibbs free energy change. (e) Schematic M vs H plot in the non-equilibrium state with strong magnetic irreversibility, showing how the irreversible magnetic entropy change relates to the irreversible Gibbs free energy change. (f) Schematic M-H loop (A-B-C-D-E-A) illustrating the internal entropy production in a cycle.
(a) Temperature dependence of the irreversible magnetic entropy change, the internal entropy production in a cycle (±5 T), and the coercive force. The solid lines are the fitting curves. (b) Schematic diagram illustrating the evolution of magnetic entropy and internal entropy production during an isothermal magnetization process in an amorphous magnetic system with RMA.
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