Berlin 2008 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 42: Phase Transitions III
MM 42.5: Vortrag
Donnerstag, 28. Februar 2008, 15:00–15:15, H 0107
Structural, magnetic and phase transformation properties of Fe-Pd-X thin films — •Sven Hamann1,2, Sigurd Thienhaus1,2, Alan Savan1, and Alfred Ludwig1,2 — 1Combinatorial Materials Science Group, Center of Advanced European Studies and Research (Caesar), Ludwig-Erhard-Allee 2, 53175 Bonn, Germany — 2Institute for Materials, Faculty of Mechanical Engineering, Ruhr-University Bochum, 44780 Bochum, Germany
The topic of this work is the development of new ferromagnetic shape memory alloys (FSMA) within the Fe-Pd-X system (X=Co, Mn,... ) with improved intrinsic properties (high transformation temperatures [MS > 100°C], high Curie temperature and high magnetocrystalline anisotropy). The advantages of Fe70 Pd30-based FSMA in comparison to Ni-Mn-Ga are higher Curie temperatures, saturation magnetization and transformation temperatures as well as potentially higher magnetocrystalline anisotropy. The Fe-Pd-X thin films were fabricated by co-sputtering from different elemental targets in a combinatorial magnetron sputter system. This method is used to create over 300 samples with different compositions on a 4" wafer substrate in one deposition process. The annealed Fe-Pd-X thin films were characterized by energy dispersive x-ray spectroscopy, electrical resistance versus temperature measurements, x-ray diffraction, vibrating sample magnetometry measurements and transmission electron microscopy. Results from several new Fe-Pd-X systems are presented, which show martensitic transformation temperatures above 100°C.