Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 8: Magnetic Materials II
MA 8.3: Vortrag
Montag, 26. März 2007, 15:45–16:00, H22
X-ray diffraction and quadratic MOKE-measurements on Co2MnSi-alloys — •Sebastian Hermsdörfer1, Oksana Gaier1, Yuya Sakuraba2, Jaroslav Hamrle1, Yasuo Ando2, Burkard Hillebrands1, and Terunobu Miyazaki2 — 1Fachbereich Physik und Forschungsschwerpunkt MINAS, Technische Universität Kaiserslautern, Erwin-Schrödinger-Str. 56, 67661 Kaiserslautern, Germany — 2Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aoba-yama 6-6-05, Aramaki, Aoba-ku, Sendai 980-8579, Japan
Heusler alloys are attracting more and more attention due to their theoretical spin polarization of up to 100 % at the Fermi level. The full Heusler alloy Co2MnSi should have a theoretical spin polarization of 100 % in its L21-structure whereas the spin polarization should be lower for the B2-structure.
In this talk, the influence of the B2 to L21 transition on the magnetic properties of the Heusler alloy Co2MnSi is reported. The transition from one structure to the other is obtained by different post-growth annealing temperatures. The crystal structure itself was determined by X-ray diffraction measurements and shows the transition between the two ordered states. Quadratic MOKE measurements have been carried out for studying the magnetic properties and show a distortion of the cubic crystal structure in the transition phase.
The work was supported by the Research Unit 559 "New materials with high spin polarization" funded by the Deutsche Forschungsgemeinschaft and by the NEDO Grant.