Single-crystal-like films are promising candidates for magnetic shape memory (MSM) applications on the microscale. For defect reduction and stress relaxation, we apply a heat treatment to pulsed laser deposited, partial epitaxial Fe–Pd films with different compositions. By recrystallization starting from the epitaxial interface, single-crystal-like films are obtained. Deformation twins being present in the as-deposited state are completely eliminated. The epitaxial (100) orientation allows clear monitoring of the transformation from face centered cubic (fcc) austenite to face centered tetragonal (fct) martensite by x-ray diffraction experiments. Transformation from fcc austenite to fct martensite is hindered by constraints from the substrate. At temperatures down to 125 K residual fcc austenite is present. Magnetic measurements performed down to 50 K indicate that during further cooling the phase transformation to body centered tetragonal martensite occurs. The results show that annealing of laser deposited films is a promising route to obtain epitaxial Fe–Pd MSM films that are suitable for applications.
Correlation of phase transformations and magnetic properties in annealed epitaxial Fe–Pd magnetic shape memory alloy films
J. Buschbeck, S. Hamann, A. Ludwig, B. Holzapfel, L. Schultz, S. Fähler; Correlation of phase transformations and magnetic properties in annealed epitaxial Fe–Pd magnetic shape memory alloy films. J. Appl. Phys. 1 June 2010; 107 (11): 113919. https://doi.org/10.1063/1.3383055
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