Spin polarization of the transport current at the free surface of bulkNiMnSb | Zendy

S. K. Clowes | Zendy; Y. Miyoshi | Zendy; Y. Bugoslavsky | Zendy; W. R. Branford | Zendy; C.E.A. Grigorescu | Zendy; Stefan A. Manea | Zendy; O. Monnereau | Zendy; L. F. Cohen | Zendy

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Spin polarization of the transport current at the free surface of bulkNiMnSb

Author(s) -

S. K. Clowes,

Y. Miyoshi,

Y. Bugoslavsky,

W. R. Branford,

C.E.A. Grigorescu,

Stefan A. Manea,

O. Monnereau,

L. F. Cohen

Publication year - 2004

Publication title -

physical review b

Language(s) - English

Resource type - Journals

eISSN - 1538-4489

pISSN - 1098-0121

DOI - 10.1103/physrevb.69.214425

Subject(s) - physics , andreev reflection , condensed matter physics , magnetization , saturation (graph theory) , spin polarization , ferromagnetism , spin (aerodynamics) , electron , superconductivity , quantum mechanics , magnetic field , combinatorics , thermodynamics , mathematics

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.

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