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Controlling Magnetic-Field-Induced Shape Memory Response in Polycrystalline Off-Stoichiometry Fe47‑xMn24+xGa29
Reddithota Vidyasagar1,2, Michal Varga3, Pavel Diko4
1Centre of Progressive Materials, TIP, Pavol Jozef Safarik University in Kosice, Tr. SNP 1, Kosice 040 01, Slovak Republic.
ACS Materials Au
|November 17, 2025
Summary
Ferromagnetic shape memory (FSM) microwires exhibit tunable thermal hysteresis due to Fe/Mn ratio changes. This compositionally driven design enables precise control over FSM behavior for magnetic actuation and sensing applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
Background:
- Ferromagnetic shape memory (FSM) materials exhibit unique properties driven by phase transformations.
- Glass-coated Fe-Mn-Ga microwires are investigated for their potential in advanced applications.
Purpose of the Study:
- To investigate the FSM behavior of glass-coated Fe-Mn-Ga microwires with varying compositions.
- To correlate the Fe/Mn atomic ratio with thermal hysteresis and magnetic transitions.
Main Methods:
- Temperature-dependent magnetization measurements.
- AC magnetic susceptibility measurements.
- Analysis of thermal hysteresis (ΔThys) and antiferromagnetic transition temperatures.
Main Results:
- Abrupt changes in magnetization with significant thermal hysteresis were observed, indicating a magnetic-field-induced martensitic transformation.
- A strong correlation between the Fe/Mn ratio and the magnitude/width of thermal hysteresis was found, with Fe45Mn26Ga29 showing a 98 K hysteresis width.
- An antiferromagnetic transition was observed, shifting from 22 to 41 K with composition, attributed to local exchange interactions.
Conclusions:
- Compositional tuning of Fe/Mn ratio precisely controls the FSM behavior in Fe-Mn-Ga microwires.
- These optimized microwires are promising for tunable magnetic actuation and sensing technologies.
Keywords:
Fe-based Heusler alloysL21 structureMartensitic transformationac magnetic susceptibilitymagnetic hysteresismagnetic shape memoryMore Related Videos
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