Dresden 2017 – wissenschaftliches Programm
MA 68.24: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-OG4
Magnetic anisotropy in Ni-PtMnGa — •Luana Caron1, Sanjay Singh1, Biswanath Dutta3, Jayita Nayak1, Sunil W. D’Souza1, Riccardo Cabassi2, Fulvio Bolzoni2, Simone Fabbrici2, Franca Albertini2, and Claudia Felser1 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2IMEM-CNR, Parma, Italy — 3Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany
Magnetic shape memory in Heusler alloys attracts a great deal of interest due to their possible applications as actuators. In materials such as Ni2MnGa1 strong magneto crystalline anisotropy(MCA) gives rise to large magnetic field induced strain (MFIS) at low applied fields which greatly exceed those induced by temperature in non-magnetic shape memory alloys. Practical application of the large MFIS in Ni2MnGa is hindered by a low martensitic transition temperature (TM) and poor mechanical stability, which still remain a challenge. Within this scope, Pt substituted Ni2MnGa alloys have been put forward as promising MFIS materials for applications. Pt substitution elevates TM2,3, making it possible to use these materials in room temperature applications. However, practical MFIS applications depend on TM as well as on the large MCA. In this work we present a detailed study of the MCA in Ni2−xPtxMnGa with x ≤ 0.25 using ab initio calculations and the singular point detection technique.4
1K. Ullakko et al., Appl. Phys. Lett. 69, 1966 (1996); 2Y. Kishi et al., Mater. Sci. Eng.: A 378, 361 (2004); 3S. Singh et al., Phys. Rev. B 93, 134102 (2016); 4G. Asti et al., J. Appl. Phys. 45, 3600 (1974).