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The Co2MnGe Heusler compound: a first principles study of the bulk phase and of the interface with GaAs

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3 Author(s)
Picozzi, S. ; Dipt. di Fisica, L''Aquila Univ., Italy ; Continenza, A. ; Freeman, A.J.

Within density functional theory, full-potential linearized augmented plane wave calculations have been performed to study the structural, electronic and magnetic properties of the Co2MnGe Heusler compound. As a result of the semiconducting (metallic) character found in the minority (majority) band structure, this material is predicted to be half-metallic, with an integer magnetic moment of 5 μB. This peculiar property, highly desired for spintronics applications, stimulated the study of the Co2MnGe/GaAs interface. Our calculations show that the predicted band offset is not suitable for spin-injection and that, due to interface states, the half-metallicity is lost in proximity to the junction.

Published in:

Magnetics, IEEE Transactions on  (Volume:38 ,  Issue: 5 )

Date of Publication:

Sep 2002

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