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Towards a full Heusler alloy showing room temperature half-metallicity at the surface

M Cinchetti1, J-P Wüstenberg1, M Sánchez Albaneda1, F Steeb1, A Conca2, M Jourdan2 and M Aeschlimann1

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In this paper we investigate the surface spin polarization in a 100 nm Co2Cr0.6Fe0.4Al film grown ex situ epitaxially on MgO(1 0 0) with a 10 nm Fe buffer layer by means of spin-resolved photoemission. We show that a careful in situ preparation of the sample surface leads to values for the room temperature spin polarization up to 45% at the Fermi level. To our knowledge, this is the highest value measured so far at the surface region of a full Heusler alloy at room temperature.


PACS

75.47.Np Metals and alloys

71.20.Be Transition metals and alloys

79.60.Dp Adsorbed layers and thin films

75.70.Rf Surface magnetism

Subjects

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Dates

Issue 6 (21 March 2007)

Received 20 September 2006, in final form 7 November 2006

Published 2 March 2007



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