Anisotropy and dynamic properties of Co2MnGe Heusler thin films |
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Authors: | M. Belmeguenai,F. Zighem,Y. Roussigné ,K. Westerholt |
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Affiliation: | a LPMTM, CNRS, Université Paris 13, 99 Avenue, J-B. Clément, 93430 Villetaneuse, France b Institut für Experimentelle Physik, Universität Regensburg, Universitätsstraße 31, 93040 Regensburg, Germany c Ruhr-Universität Bochum, 44780 Bochum, Germany |
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Abstract: | Co2MnGe films of 30 and 50 nm in thickness were grown by RF-sputtering. Their magnetic anisotropies, dynamic properties and the different excited spin wave modes have been studied using conventional ferromagnetic resonance (FMR) and Microstrip line FMR (MS-FMR). From the in-plane and the out-of-plane resonance field values, the effective magnetization (4πMeff) and the g-factor are deduced. These values are then used to fit the in-plane angular-dependence of the uniform precession mode and the field-dependence of the resonance frequency of the uniform mode and the first perpendicular standing spin wave to determine the in-plane uniaxial, the four-fold anisotropy fields, the exchange stiffness constant and the magnetization at saturation. The samples exhibit a clear predominant four-fold magnetic anisotropy besides a smaller uniaxial anisotropy. This uniaxial anisotropy is most probably induced by the growth conditions. |
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Keywords: | 76.50.+g 75.30.Gw 75.40.Gb |
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