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.
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1 June 2010
Research Article|
June 09 2010
Correlation of phase transformations and magnetic properties in annealed epitaxial Fe–Pd magnetic shape memory alloy films
J. Buschbeck;
J. Buschbeck
1
IFW Dresden
, P.O. Box: 270116, 01171 Dresden, Germany
2Faculty of Mechanical Engineering, Institute for Materials Science,
Dresden University of Technology
, 01062 Dresden, Germany
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S. Hamann;
S. Hamann
3Institute of Materials, Faculty of Mechanical Engineering,
Ruhr-University Bochum
, 44780 Bochum, Germany
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A. Ludwig;
A. Ludwig
3Institute of Materials, Faculty of Mechanical Engineering,
Ruhr-University Bochum
, 44780 Bochum, Germany
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B. Holzapfel;
B. Holzapfel
1
IFW Dresden
, P.O. Box: 270116, 01171 Dresden, Germany
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L. Schultz;
L. Schultz
1
IFW Dresden
, P.O. Box: 270116, 01171 Dresden, Germany
2Faculty of Mechanical Engineering, Institute for Materials Science,
Dresden University of Technology
, 01062 Dresden, Germany
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a)
Author to whom correspondence should be addressed. Electronic mail: s.faehler@ifw-dresden.de.
J. Appl. Phys. 107, 113919 (2010)
Article history
Received:
December 18 2009
Accepted:
March 09 2010
Citation
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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