Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 51: Magnetic Half-metals and Oxides II
MA 51.2: Vortrag
Donnerstag, 17. März 2011, 11:15–11:30, HSZ 401
Quadratic MOKE on Co-based Heusler compounds — •Georg Wolf1, Jaroslav Hamrle2, Britta Leven1, Daniel Ebke3, Andy Thomas3, Günter Reiss3, and Burkard Hillebrands1 — 1FB Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany — 2Institute of Physics, VSB - Technical University of Ostrava, Czech Republic — 3Thin Films and Physics of Nanostructures, Physics Department, Bielefeld University, Germany
The intensive research on Co-based Heusler compounds revealed that some of these materials show a large quadratic magneto-optical Kerr effect (QMOKE) [1,2]. The presence of QMOKE strongly depends on the electronic band structure. In the case of Heusler compounds the electronic bands can be modified by changing the composition or improving the crystalline structure. This work presents a systematic study on several Heusler compounds (Co2FeSi, Co2Fe0.5Mn0.5Si, Co2MnSi and Co2FeAl0.5Si0.5). The amplitude of the QMOKE is investigated as a function of the post deposition annealing temperature, which is known to improve the crystal ordering. We find that the QMOKE is increasing with the annealing temperature. From this we conclude that there is a strong correlation between the presence of QMOKE and the high crystalline ordering in Heusler compounds.
The DFG Research Unit 559, New Materials with High Spin Polarization, and the BMBF project Heuspin are gratefully acknowledged for financial support.
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