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Magnetism and Structure of Magnetic Multilayers Based on the Fully Spin Polarized Heusler Alloys Co2MnGe and Co2MnSn

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Half-metallic Alloys

Part of the book series: Lecture Notes in Physics ((LNP,volume 676))

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Abstract

Our Introduction starts with a short general review of the magnetic and structural properties of the Heusler compounds which are under discussion in this book. Then, more specifically, we come to the discussion of our experimental results on multilayers composed of the Heusler alloys Co2MnGe and Co2MnSn with V or Au as interlayers. The experimental methods we apply combine magnetization and magnetoresistivity measurements, x–ray diffraction and reflectivity, soft x-ray magnetic circular dichroism and spin polarized neutron reflectivity. We find that below a critical thickness of the Heusler layers at typically dcr = 1.5 nm the ferromagnetic order is lost and spin glass order occurs instead. For very thin ferromagnetic Heusler layers there are pecularities in the magnetic order which are unusual when compared to conventional ferromagnetic transition metal multilayer systems. In [Co2MnGe/Au] multilayers there is an exchange bias shift at the ferromagnetic hysteresis loops at low temperatures caused by spin glass ordering at the interface. In [Co2MnGe/V] multilayers we observe an antiferromagnetic interlayer long range ordering below a well defined Néel temperature originating from the dipolar stray fields at the magnetically rough Heusler layer interfaces.

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  1. Institut für Experimentalphysik IV, Ruhr-Universität Bochum, D-44780 Bochum, Germany

    K. Westerholt, A. Bergmann, J. Grabis, A. Nefedov & H. Zabel

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  1. K. Westerholt
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  2. A. Bergmann
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  3. J. Grabis
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I. Galanakis P.H. Dederichs

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Westerholt, K., Bergmann, A., Grabis, J., Nefedov, A., Zabel, H. Magnetism and Structure of Magnetic Multilayers Based on the Fully Spin Polarized Heusler Alloys Co2MnGe and Co2MnSn. In: Galanakis, I., Dederichs, P. (eds) Half-metallic Alloys. Lecture Notes in Physics, vol 676. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11506256_3

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