Abstract
In this work, the temperature and time dependence of the magnetic properties of a polycrystallineNi49.7Mn24.1Ga26.2 alloy is analysed. The law of approach to magnetic saturation has been employed toestimate the magnetic anisotropy in the three structural phases of the alloy (martensitic,pre-martensitic and austenitic). The temperature dependences of magnetic parameters,such as the magnetic susceptibility and coercive field, are interpreted in terms of thechanges in the magnetic anisotropy taking place with the structural transformations. Thestrong magnetocrystalline anisotropy is confirmed to mainly control the magnetic responseof the low temperature martensitic phase. Furthermore, magnetic relaxation studies(magnetic after-effect) have been employed to analyse the main differences between themagnetization processes in the three characteristic structural phases. The time decay of themagnetization displays a distinctive response in the pre-martensitic state. The results(logarithmic time decay of the remanent magnetization and field dependence ofthe magnetic viscosity) indicate the thermally activated nature of the relaxationprocess.
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