Resonant ultrasound spectroscopy – a tool to probe magneto-elastic properties of ferromagnetic shape memory alloys

Oleg Heczko (), Hanuš Seiner, Petr Sedlák, Jaromír Kopeček, Vít Kopecký and Michal Landa

The European Physical Journal B: Condensed Matter and Complex Systems, 2013, vol. 86, issue 2, 1-5

Abstract: Resonant ultrasound spectroscopy (RUS) was used to investigate the changes of elastic properties induced by magnetic field in magnetic shape memory alloys Ni-Mn-Ga and Co-Ni-Al. In contrast to large magneto-elastic response of Ni 2 MnGa austenite, there is only very weak response of Co-Ni-Al. This indicates that the austenite phase of Ni-Mn-Ga can have a privileged position and this may be a reason for the existence of magnetic shape memory effect. In contrast to austenite, the magneto-elastic response in Ni-Mn-Ga martensite is very small with large damping due to existence of twin boundaries. The measurement showed that RUS can be a powerful method to probe magneto-elastic properties of shape memory alloys. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Keywords: Topical issue: New Trends in Magnetism and Magnetic Materials. Guest editors: Francesca Casoli; Massimo Solzi and Paola Tiberto (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1140/epjb/e2012-30937-8

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