Magnetic Domain Walls and Macroscopic Magnetization-Related Elastic and Anelastic Effects during Premartensitic Transition in Ni(2)MnGa

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 Ni(2)MnGa shape memory alloy close to the premartensitic transformation temperature, T(PM), in the demagnetized state and u...

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Detalles Bibliográficos
Autores principales: Kustov, Sergey, Rosselló, Jaume, Corró, Miguel Lluís, Kaminskii, Vladimir, Sapozhnikov, Konstantin, Saren, Andrey, Sozinov, Aleksei, Ullakko, Kari
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6384950/
https://www.ncbi.nlm.nih.gov/pubmed/30691045
http://dx.doi.org/10.3390/ma12030376
Descripción
Sumario: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 Ni(2)MnGa shape memory alloy close to the premartensitic transformation temperature, T(PM), in the demagnetized state and under moderate fields. Several new effects observed like an apparent Young´s modulus softening close to T(PM) under moderate fields, instead of the hardening outside this range, as well as existing controversies in the apparent elastic and anelastic properties of Ni(2)MnGa close to T(PM) are explained by microeddy and macroeddy current relaxations that to date have been disregarded.

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