Spin reorientation in premartensite and austenite Ni–Mn–Ga

The premartensite state of Ni–Mn–Ga magnetic shape memory alloy, sometimes called the martensite precursor state, was studied by careful and detailed measurement of the evolution of magnetization curves of magnetically closed samples to evidence local symmetry breaking. During the heating cycle afte...

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Bibliographic Details
Published in:Applied physics letters 2024-07, Vol.125 (2)
Main Authors: Perevertov, Alexej, Colman, Ross H., Heczko, Oleg
Format: Article
Language:English
Subjects:
Broken symmetry
Curie temperature
Magnetization curves
Manganese
Martensite
Martensitic transformations
Nickel
Shape memory alloys
Transformation temperature
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Summary:The premartensite state of Ni–Mn–Ga magnetic shape memory alloy, sometimes called the martensite precursor state, was studied by careful and detailed measurement of the evolution of magnetization curves of magnetically closed samples to evidence local symmetry breaking. During the heating cycle after the martensite transformation, the magnetization loop slowly transforms from a typical sigmoidal shape, corresponding to the magnetization along the easy axis, to a constricted loop indicative of magnetization along a harder magnetic axis. These changes are explained by a switching of the macroscopic magnetic easy axis from [100] to [110]. Above the premartensite transformation temperature, the magnetic easy axis slowly changes back to [100]. After cooling the sample, starting at the Curie temperature, the process reverses.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0216695