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Finite Size-Effects in Martensite Microstructure of Magnetic Shape Memory Films.

Satyakam Kar1,2,3, Aman Singh2,4, Kornelius Nielsch1,2

  • 1Institute for Metallic Materials, Leibniz IFW Dresden, Dresden, Germany.

Small (Weinheim an Der Bergstrasse, Germany)
|February 4, 2026
PubMed
Summary

This study investigates size effects in magnetic shape memory alloy microstructures. Finite sizes in Ni-Mn-Ga films retain microstructure characteristics, revealing size-dependent behaviors crucial for microsystem applications.

Keywords:
epitaxial filmsmagnetic shape memory alloysmartensite microstructuremicrofabricationsize‐effect

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Magnetic shape memory alloys (MSMAs) offer multifunctional properties for microsystems.
  • Their properties stem from combined ferroelasticity and ferromagnetism.
  • Size effects in ferromagnetic microstructures are known, but less studied in ferroelastic martensites.

Purpose of the Study:

  • To investigate the influence of finite size on the martensite microstructure of Ni-Mn-Ga based magnetic shape memory alloys.
  • To compare size effects in ferroelastic martensite with those in ferromagnetic microstructures.
  • To understand these effects under both constrained and freestanding conditions.

Main Methods:

  • Utilizing epitaxially grown Ni-Mn-Ga films as a model system.
  • Employing microfabrication techniques to create patterned structures.
  • Analyzing microstructural characteristics under constrained and freestanding conditions.

Main Results:

  • Microfabricated patterns in Ni-Mn-Ga films maintained characteristics of continuous films.
  • Finite size significantly influences martensite microstructure, particularly with film thickness.
  • Similarities and differences between ferromagnetic and ferroelastic size effects were identified.

Conclusions:

  • Finite size effects in Ni-Mn-Ga martensite microstructure are significant and size-dependent.
  • Understanding these effects is critical for the successful integration of MSMAs into microsystems.
  • The study provides insights into tailoring MSMA properties for advanced microdevices.