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A Landau-Ginzburg Description of Sb Overlayers

Published online by Cambridge University Press:  21 March 2011

R. Skomski ,
T. Komesu ,
H.-K. Jeong ,
C. N. Borca ,
P. A. Dowben ,
D. Ristoiu  and
J. P. Nozieres
R. Skomski
Affiliation:
Department of Physics and Astronomy and Center for Materials Research and Analysis, University of Nebraska, Lincoln, NE 68508
T. Komesu
Affiliation:
Department of Physics and Astronomy and Center for Materials Research and Analysis, University of Nebraska, Lincoln, NE 68508
H.-K. Jeong
Affiliation:
Department of Physics and Astronomy and Center for Materials Research and Analysis, University of Nebraska, Lincoln, NE 68508
C. N. Borca
Affiliation:
Department of Physics and Astronomy and Center for Materials Research and Analysis, University of Nebraska, Lincoln, NE 68508
P. A. Dowben
Affiliation:
Department of Physics and Astronomy and Center for Materials Research and Analysis, University of Nebraska, Lincoln, NE 68508
D. Ristoiu
Affiliation:
CNRS, Laboratoire Louis Néel, Avenue des Martyrs BP 166, 38042 Grenoble, CEDEX 09, France
J. P. Nozieres
Affiliation:
CNRS, Laboratoire Louis Néel, Avenue des Martyrs BP 166, 38042 Grenoble, CEDEX 09, France
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Abstract

The spin polarization of Sb overlayers on the semi-Heusler alloy NiMnSb is investigated in terms of the Landau-Ginzburg approach. The half-metallic semi-Heusler alloy NiMnSb acts as a ferromagnetic perturbation and induces a spin polarization in the semimetallic Sb overlayer. Using a Gaussian approximation, the propagation of the spin perturbation in the overlayer is calculated. The results are compared with spin-polarized inverse photoemission spectroscopy (SPIPES) results and with recent spin-dependent envelope-function approximation (SDEFA) predictions. The Landau-Ginzburg parameters are both band-structure and temperature dependent, and it is argued that thermal spin excitations lead to an injection depth decreasing as 1//T law at high temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 674: Symposia T/U/V – Applications of Ferromagnetic and Optical Materials, Storage and Magnetoelectronics , 2001 , U7.10
Copyright
Copyright © Materials Research Society 2001

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References

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