Elsevier

Scripta Materialia

Volume 156, November 2018, Pages 101-104
Scripta Materialia

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

https://doi.org/10.1016/j.scriptamat.2018.07.015Get rights and content

Abstract

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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Acknowledgments

This work has been carried out with the financial support of the Spanish Ministry of Economy and Competitiveness (project MAT2014-56116-C4-1-3-4-R) and Basque Government Department of Education (project IT711-13). Technical and human support provided by SGIker (UPV/EHU) and, in particular, by I. Orue and A. Larrañaga, is appreciated. Funding from DFG (P.D., S.S., A.L.) within the projects FOR 1766/2 (LU1175/11-2) and LU1175/12-1 is acknowledged. V.A. acknowledges support from the Hellenic

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