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Berlin 2008 – scientific programme

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MA: Fachverband Magnetismus

MA 14: Magnetic Half Metals and Oxides

MA 14.4: Talk

Tuesday, February 26, 2008, 11:15–11:30, EB 202

Magnetic anisotropy and exchange interaction in Co2-based Heusler compounds — •Jaroslav Hamrle1, Oksana Gaier1, Burkard Hillebrands1, Horst Schneider2, Gerhard Jakob2, Martin Jourdan2, Yuya Sakuraba3, Takahide Kubota4, Mikihiko Oogane4, and Yasuo Ando41FB Physik and FFSP MINAS, TU Kaiserslautern, Erwin Schrödinger-Str. 56, D-67663 Kaiserslautern, Germany — 2Institut für Physik, Johannes-Gutenberg-Universität, D-55128, Mainz, Germany — 3Institute of Materials Research, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan — 4Graduate School of Engineering, Tohoku University, Aoba-yama 6-6-05, Sendai 980-8579, Japan

Co2-based Heusler compounds are promising candidates to provide 100% spin polarization. We report on magnetic anisotropy, exchange interaction and magnetization reversal in Co2FeSi, Co2Cr0.6Fe0.4Al (CCFA), Co2MnSi and Co2MnAlxSi1−x Heusler compounds using Mageto-Optical Kerr effect magnetometry and Brillouin ligh scattering spectroscopy. The samples are studied as a function of sample composition, sample ordering and sample thickness. It is shown that inside ordered CCFA or Co2FeSi films, there is a wide distribution of the internal field, smearing out the internal 4-fold anisotropy and providing a constant coercive field independent of the sample orientation. The values of the exchange stiffness constant for various Heusler compounds are presented. The project was financially supported by the Research Unit 559 “New materials with high spin polarization” funded by the DFG and by the NEDO Programm 2004/T093.

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