Magnetic-field-induced strain in an antiferromagnetic γ-MnNi alloy

摘要

In the present study, the fcc → fct martensitic transformation and antiferromagnetic transition of the Mn_(82.2)Ni_(17.8) alloy are studied by electric resistance measurement, dynamic mechanical analyzer, and transmission electron microscopy. The magnetic-field-induced strain associated with antiferromagnetic-order twin martensitic structure of the polycrystalline antiferromagnetic alloy is investigated. In addition, the threshold field of magnetic-field-induced strain of antiferromagnetic materials and the relation of antiferromagnetic domains and martensitic twins are discussed qualitatively.