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Magnetic Domain Walls and Macroscopic Magnetization-Related Elastic and Anelastic Effects during Premartensitic
Sergey Kustov1, Jaume Rosselló2, Miguel Lluís Corró3
1Departament de Física; Universitat de les Illes Balears, Palma de Mallorca 07122, Spain. Sergey.Kustov@uib.es.
Abstract:
The temperature and field dependences of internal friction and Young´s modulus are studied using a high-resolution ultrasonic (90 kHz) technique in stoichiometric ferromagnetic Ni₂MnGa shape memory alloy close to the premartensitic transformation temperature, TPM, in the demagnetized state and under moderate fields. Several new effects observed like an apparent Young´s modulus softening close to TPM under moderate fields, instead of the hardening outside this range, as well as existing controversies in the apparent elastic and anelastic properties of Ni₂MnGa close to TPM are explained by microeddy and macroeddy current relaxations that to date have been disregarded.
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