Abstract
Two Mn–Fe–Ni–Ge ribbon samples are prepared. Due to the inherent antiferromagnetic (AFM) interaction and its instability, the Fe-substitution induces the magnetic-field-induced AFM-ferromagnetic (FM) conversion and then, the competition between the established FM coupling and the intrinsic AFM interaction triggers the first-order AFM–FM magnetoelastic transition in TiNiSi-type state for these two ribbons. When the AFM–FM conversion completes, the coupled magnetostructural transformation from the FM TiNiSi-type to paramagnetic Ni2In-type state with large magnetocaloric effect near room temperature is achieved in these two ribbons.
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