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Abstract The magneto-structural coupling of non-stoichiometric Ni50Mn35.4In14.6 alloy is investigated by the first-principles calculations in view of phase stability and magnetic properties of the austenite, the six-layered modulated (6M) martensite,… Click to show full abstract
Abstract The magneto-structural coupling of non-stoichiometric Ni50Mn35.4In14.6 alloy is investigated by the first-principles calculations in view of phase stability and magnetic properties of the austenite, the six-layered modulated (6M) martensite, and the non-modulated (NM) martensite. The calculated martensitic phase transformation sequence of the Ni50Mn35.4In14.6 alloy is Paramagnetic Austenite (PA) → Ferromagnetic Austenite (FA) → Ferrimagnetic 6M (FIM 6M) → Ferrimagnetic NM (FIM NM) as a function of temperature. The Mn-Mn interatomic distance reduces significantly when the FA parent phase transforms to a 6M or NM martensitic phase. At the same time, magnetism of the alloy changes from ferromagnetic to ferrimagnetic; this is a typical magneto-structural coupling phenomenon. The Ni 3d state electrons play an important role in driving martensitic transformation for the Ni50Mn35.4In14.6 alloy.
Journal Title: Journal of Magnetism and Magnetic Materials
Year Published: 2019
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