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Half-metallic Alloys pp 187–220Cite as

Growth and Magnetotransport Properties of Thin Co2MnGe Layered Structures

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

Abstract

Co2MnGe and other related Heusler alloys are investigated in the context of magnetotransport properties in multilayer (ML) structures. The most important factors relevant to the problem of magnetotransport in these MLs are reviewed including (i) the growth of thin film Hesuler alloy structures by Molecular Beam Epitaxy and Magnetron Sputtering techniques; (ii) the effects of finite temperature on the half-metallicity, interface states and band structure matching (iii) the type of measured carrier transport and its relationship with the underlying band structure; and finally (iv) the magnetic interactions in an all Heusler ML structure. We have measured a room temperature current-in-plane (CIP) GMR effect in MLs and spin valves and attribute their small magnetoresistance to the materials high resistivity and low carrier mobility that is an inherent property of the Heusler alloys due to their complicated band structure for these p-type conductors. The main challenges for achieving an enhanced GMR effect in Heusler ML structures are discussed on the basis of our room temperature magneto-transport measurements and theoretical modelling results.

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  1. Seagate Research, 1251 Waterfront Place, Pittsburgh, PA, USA

    Thomas Ambrose & Oleg Mryasov

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  1. Thomas Ambrose
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I. Galanakis P.H. Dederichs

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Ambrose, T., Mryasov, O. Growth and Magnetotransport Properties of Thin Co2MnGe Layered Structures. In: Galanakis, I., Dederichs, P. (eds) Half-metallic Alloys. Lecture Notes in Physics, vol 676. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11506256_6

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  • DOI: https://doi.org/10.1007/11506256_6

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