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 Fähler¹ — ¹IFW 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 Fe₇₀Pd_30−xCu_x 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.