Dresden 2009 – scientific programme
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MA: Fachverband Magnetismus
MA 13: Poster Ia: Electron Theory (1); Magnetic Imaging (2,3); Thin Films (4-25); MSMA (26-33); Magn. Semiconductors (34-42); Magn. Half Metals and Oxides (43-60)
MA 13.26: Poster
Tuesday, March 24, 2009, 10:15–13:00, P1A
Thin film growth and shape memory in the Heusler compound Mn2NiGa — •Catherine Jenkins1,2, Tobias Eichhorn2, Ramamoorthy Ramesh1, and Gerhard Jakob2 — 1UC Berkeley, Berkeley, 94720, USA — 2University Mainz, 55122 Mainz, Germany
The ferromagnetic shape memory effect has been known for more than a decade in cubic to tetragonal Ni2MnGa with a maximum of 10% strain in single crystals. Recent work in fully epitaxial single crystals of Ni2MnGa on MgO and Al2O3 demonstrated our group*s ability to process high quality ferromagnetic shape memory films in novel form [1]. Mn2NiGa has a higher Curie temperature in the stoichiometric compound and an analogous crystal structure to the prototypical Ni2MnGa but due to the higher tetragonal distortion with transformation the theoretical strain is closer to 20%. The first thin films of these compounds are synthesized and the shape memory effect is investigated. Comparison in the magnetic data is made to calculations.
[1] Jenkins et al, APL, December 2008. [2] Liu et al, Phys. Rev. B, 74, 054435 (2006) [3] Barman and Chakrabarti, PRB April 2008.