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Spin Polarization of the Transport Current at the Free Surface of Bulk NiMnSb

Clowes, S K, Miyoshi, Y, Bugoslavsky, Y, Branford, W R, Grigorescu, C, Manea, S A, Monnereau, O and Cohen, L F (2004) Spin Polarization of the Transport Current at the Free Surface of Bulk NiMnSb Physical Review B, 69 (21). ISSN 1098-0121

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Abstract

The point contact Andreev reflection employing niobium tips was used to determine the degree of transport current spin polarization ( Pt ) at the free surface of bulk NiMnSb at 4.2 K . The data was analyzed within the framework of a modified version of the Blonder, Tinkham, and Klapwijk formulism taking into account the two spin polarized channels in the ferromagnet and treating the interface as a planar delta function barrier of height Z between free electron materials. We find that the measured spin polarization is rather insensitive to different surface preparations and magnetic domain structure, and the maximal value of the Pt at Z=0 is 44% , consistent with recent calculations of the surface reconstruction of NiMnSb . Saturation magnetization of the samples was found to be 3.6 ìB per formula unit indicative of a small amount of atomic disorder.

Item Type: Article
Additional Information: Clowes, S. K., Miyoshi, Y., Bugoslavsky, Y., Branford, W. R., Grigorescu, C., Manea, S. A., Monnereau, O., and Cohen, L. F. (2004) Spin Polarization of the Transport Current at the Free Surface of Bulk NiMnSb. <i>Physical Review B, </i>69, Iss. 21, Article 214425. © 2004 The American Physical Society Click <a href=http://prb.aps.org/ >here</a> to visit the journal's website. This article was published when S. K. Clowes was with the Department of Physics, Imperial College, London.
Divisions: Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Photonics
Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:44
Last Modified: 23 Sep 2013 18:34
URI: http://epubs.surrey.ac.uk/id/eprint/1758

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