We report that a spontaneous strain glass to martensite (STG-M) transition occurs in a Ni45Co10Mn20Ga25 ferromagnetic strain glass. The signatures of the spontaneous STG-M transition of Ni45Co10Mn20Ga25 ferromagnetic strain glass are stronger than those of Ti50Ni44.5Fe5.5 strain glass reported previously. Such a difference is attributed to that the martensitic terminal of the former has larger elastic anisotropy than that of the later. The spontaneous STG-M transition in this ferromagnetic strain glass is due to that the delicate competition between the kinetic limitation and the martensitic thermodynamic driving force changes with temperature.

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