XRD patterns for Mn5Ge2.5Al0.5 powders and ribbons. Inset: SEM image of the surface of Mn5Ge2.5Al0.5 ribbon.
(a) Isothermal magnetization curves of Mn5Ge2.5Al0.5 ribbons in the vicinity of TC . (b) Arrott plot isotherms of M 2 vs H/M curves.
(a) Temperature dependence of the spontaneous magnetization Ms (left) and the inverse initial susceptibility (right). (b) KF plots for the spontaneous magnetization Ms (left) and the inverse initial susceptibility (right). (c) lnM vs lnH curve at the Curie temperature. (d) Logarithmic scaling plot of vs in the critical region.
(a) Entropy changes of different compositions under different external magnetic fields. (b) The universal behavior of Mn5Ge3- x Al x compounds.
The Curie temperature and critical exponents for different compositions and theoretical models, as well as the peak entropy change at 3 T.
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