Abstract
The structural features, martensitic transformation, and magnetic domains in the Mn50Ni40Sn10 Heusler alloy are investigated by in-situ transmission electron microscopy and Lorentz microscopy. A rich variety of microstructural phenomena arising from structural and magnetic transitions are demonstrated at low temperatures. The “5M” or “6M” superstructure modulations and needle-shaped martensites have been clearly observed in the martensitic phase. Structural evolutions of magnetic domains are revealed under in-situ applied magnetic fields using Lorentz microscopy. The structural domains and reversibility of the phase transitions are analyzed based on our experimental observations and discussed in comparison with results of low-temperature magnetization.
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