The ferromagnetic shape memory (FSM) behavior of glass-coated Fe47‑x Mn24+x Ga29 (x = 0-8 at. %) microwires has been investigated through temperature-dependent magnetization and ac magnetic susceptibility measurements. Magnetization measurements as a function of temperature reveal an abrupt increase and decrease in magnetization upon cooling and heating, respectively, indicating characteristic thermal hysteresis (ΔT hys ) behavior typically associated with a magnetic-field-induced "diffusionless" martensitic transformation. The magnitude and width of ΔT hys are strongly correlated with the Fe/Mn atomic ratio; notably, the Fe45Mn26Ga29 microwire exhibits a very large ΔT hys width of 98 K, which is attributed to local deformation involving the motion of Fe and Mn atoms. Furthermore, an antiferromagnetic transition is observed in a low-temperature region, shifting from 22 to 41 K depending on composition. This shift is attributed to variations in local exchange interactions arising from unequal occupation of Fe and Mn 3d orbitals. These findings highlight a compositionally driven design strategy that enables precise tuning of FSM behavior, making Fe-Mn-Ga microwires promising candidates for use in tunable magnetic actuation and sensing technologies.

Centre of Progressive Materials TIP Pavol Jozef Safarik University in Kosice Tr SNP 1 Kosice 040 01 Slovak Republic

Departamento de Física Universidade Federal de Pernambuco Recife Pernambuco 50670 901 Brazil

Faculty of Materials Metallurgy and Recycling at the Technical University of Kosice Letna 9 Kosice 042 00 Slovak Republic

Institute of Experimental Physics Slovak Academy of Sciences Watsonova 47 Košice 040 01 Slovak Republic

Institute of Physics Czech Academy of Sciences Na Slovance 2 182 00 Praha 8 Czech Republic

RVmagnetics Nemcovej 30 Kosice 04001 Slovakia

Science institute University of Iceland Dunhaga 3 Reykjavik IS 107 Iceland

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