Martensitic transformation hysteresis in Ni(Co)-Mn-Sn/MgO metamagnetic shape memory thin films

• Published in: Scripta materialia Vol. 156; pp. 101 - 104
• Main Authors: Alexandrakis, V., Aseguinolaza, I.R., Decker, P., Salomon, S., Barandiarán, J.M., Ludwig, A., Chernenko, V.A.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-11-2018
• Subjects: Critical behaviour; Martensitic transformation; Ni(Co)-Mn-Sn/MgO thin films; Shape memory; Thermal hysteresis; Martensitic transformation; Critical behaviour; Thermal hysteresis; Shape memory; Ni(Co)-Mn-Sn/MgO thin films
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/j.scriptamat.2018.07.015

Hysteresis of martensitic transformations (MTs) is a crucial factor which affects the efficiency and lifetime of actuators and magnetocaloric devices. In the present work we found a tenfold reduction of the thermal hysteresis of MT caused by increasing the MT temperature in a series of Ni(Co)-Mn-Sn thin films deposited onto MgO (001). We have observed that this evolution is accompanied by a drastic change of the temperature dependence of the lattice parameter in the temperature interval of MT. Such a behaviour can be interpreted using the concept of the critical state, where an anhysteretic behaviour is expected.
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