https://doi.org/10.1140/epjb/e2012-30937-8
Regular Article
Resonant ultrasound spectroscopy – a tool to probe magneto-elastic properties of ferromagnetic shape memory alloys*
1
Institute of Physics, Academy of Sciences of the Czech
Republic, Na Slovance
2, 182 21
Prague 8, Czech
Republic
2
Institute of Thermomechanics, Academy of Sciences of the Czech
Republic, Dolejskova
5, 182 00
Prague 8, Czech
Republic
a e-mail: heczko@fzu.cz
Received:
12
October
2012
Received in final form:
5
December
2012
Published online:
20
February
2013
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 Ni2MnGa 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.
Key words: Topical issue: New Trends in Magnetism and Magnetic Materials. Guest editors: Francesca Casoli, Massimo Solzi and Paola Tiberto
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2013