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Berlin 2012 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 53: Joint Session Magnetic Shape Memory Alloys II (jointly with DS, MA)

MM 53.2: Talk

Thursday, March 29, 2012, 15:15–15:30, H 0112

Structure and magnetic properties of epitaxial Fe-Pd-Cu films — •Sandra Kauffmann-Weiss1, Sven Hamann2, Markus E. Gruner3, Peter Entel3, Ludwig Schultz1, Alfred Ludwig2, and Sebastian Fähler11IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, 01171 Dresden — 2Ruhr-Universität Bochum, Institut für Werkstoffe, Universitätsstraße 150, 44780 Bochum — 3University of Duisburg-Essen, Theoretical Physics, Lotharstraße 1, 47048 Duisburg

Epitaxial films are promising candidates for magnetic shape memory (MSM) applications on the microscale. We investigated the magnetic properties of Fe70Pd30−xCux ferromagnetic shape memory alloys with different Cu contents (x = 0, 3, 7) in strained epitaxial films. For the MSM alloy Fe70Pd30 we recently demonstrated, that a tetragonal distortion up to 54 % can be induced into the crystal lattice by strained epitaxial film growth [S. Kauffmann-Weiss et al., Phys. Rev. Lett. 107, 2011, 206105]. Due to the tetragonal distortion intrinsic magnetic properties like Curie temperature, saturation magnetisation and magnetocrystalline anisotropy can be controlled. Epitaxial Fe70Pd27Cu3 and Fe70Pd23Cu7 films show slightly lowered values for spontaneous polarisation and Curie temperature, but strongly increased magnetocrystalline anisotropy constants compared to the binary Fe70Pd30 alloy and the Ni-Mn-Ga prototype system. These results indicate that alloying of Fe70Pd30 with Cu is a promising route to fabricate films with excellent magnetic properties to be used for the MSM effect.

This work is supported by DFG through SPP1239.

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