Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 14: Magnetic Half Metals and Oxides
MA 14.6: Vortrag
Dienstag, 26. Februar 2008, 11:45–12:00, EB 202
Modification of structural and magnetic properties of Co2FeSi and Co2MnSi Heusler compounds by ion irradiation — •Oksana Gaier1, Jaroslav Hamrle1, Burkard Hillebrands1, Horst Schneider2, Gerhard Jakob2, Yuya Sakuraba3, Sumito Tsunegi3, Mikihiko Oogane3, Yasuo Ando3, Jürgen Fassbender4, Bernhard Reuscher5, Alexander Brodyanski5 und Michael Kopnarski5 — 1TU Kaiserslautern, 67663 Kaiserlautern — 2Johannes-Gutenberg-Universität, 55128 Mainz — 3Tohoku University, Sendai 980-8579, Japan — 4Forschungszentrum Dresden-Rossendorf, 01328 Dresden — 5IFOS, TU Kaiserslautern, 67663 Kaiserslautern
Spin polarization in Co2FeSi and Co2MnSi Heusler compounds is believed to be very sensitive to the degree of L21 order. In thin films, the transition from the disordered to the L21 ordered phase is usually achieved by an annealing step after film deposition. This procedure, however, is not suitable if local modifications of crystallographic properties are required. In such a case irradiation with keV ions is a convenient tool as reported for FePd and FePt films. Here, we report on the dependence of structural and magnetic properties of thin Co2FeSi and Co2MnSi films on the irradiation by 30 keV He+ and Ga+ ions.
The project was financially supported by the Research Unit 559 "New materials with high spin polarization" funded by the DFG, by the NEDO International Joint Research Grant Programm 2004/T093 and by the Stiftung Rheinland-Pfalz für Innovation.