Dresden 2011 – scientific programme
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MA: Fachverband Magnetismus
MA 38: Magnetization Dynamics IV
MA 38.10: Talk
Wednesday, March 16, 2011, 17:00–17:15, HSZ 403
Understanding demagnetization dynamics in the Heusler alloy Co2Mn1−xFexSi — •Daniel Steil1, Sabine Alebrand1, Tobias Roth1, Michael Krauß1, Takahide Kubota2, Mikihiko Oogane2, Yasuo Ando2, Hans Christian Schneider1, Martin Aeschlimann1, and Mirko Cinchetti1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, 67653 Kaiserslautern, Germany — 2Department of Applied Physics, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
We have investigated ultrafast demagnetization in the half-metallic Heusler alloy system Co2Mn1−xFexSi (CMFS). The two investigated compounds CMS and CFS are predicted to be half metallic [1], with a different lineup of the minority band gap and the Fermi level. In CMS, the Fermi energy is lined up to the top of the valence band, while in CFS to the bottom. Despite such differences, both alloys show remarkably similar magnetization dynamics, as measured by the time-resolved magneto optical Kerr effect. Based on the experimental observations and our recent dynamical model that includes momentum- and spin-dependent carrier scattering [2], we show that magnetization dynamics are dominated by hole spin flips below the Fermi energy, which are not influenced by the band gap [3].
B. Balke et al., Phys. Rev. B 74, 104405 (2006)
M. Krauß et al., Phys. Rev. B 80, 180407 (2009)
D. Steil et al., Phys. Rev. Lett. 105, 217202 (2010)