Hostname: page-component-8448b6f56d-dnltx Total loading time: 0 Render date: 2024-04-23T13:58:54.488Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

[1] Groot, R. A. de and Buschow, K. H. J., J. Magn. Magn. Mater. 54–57 (1986) 1377.Google Scholar
[2] Liu, Y. and Allen, R. E., Phys. Rev. B 52 (1995) 1566.10.1103/PhysRevB.52.1566Google Scholar
[3] Borca, C. N., Komesu, T., Jeong, H.-K., Dowben, P. A., Ristoiu, D., Hordequin, Ch., Pierre, J., and Nozières, J. P., Appl. Phys. Lett. 77 (2000) 88.Google Scholar
[4] Ristoiu, D., Nozières, J. P., Borca, C. N., Borca, B., Dowben, P. A., Appl. Phys. Lett. 76 (2000) 2349.Google Scholar
[5] Ristoiu, D., Nozieres, J. P., Borca, C. N., Komesu, T., Jeong, H.-K., and Dowben, P. A., Europhys. Lett. 43 (2000) 624.Google Scholar
[6] Komesu, T., Borca, C. N., Jeong, H.-K., Dowben, P. A., Ristoiu, D., Nozières, J. P., Stadler, Sh., Idzerda, Y. U., Phys. Lett. A 273 (2000) 245.Google Scholar
[7] Hunziker, M. and Landolt, M., Phys. Rev. Lett. 84 (2000) 4713.Google Scholar
[8] Skomski, R., Komesu, T., Borca, C. N., Jeong, H.-K., Dowben, P. A., Ristoiu, D., and Nozières, J. P., J. Appl. Phys. (2001) in press.Google Scholar
[9] , García-Moliner and Flores, F., “Introduction to the Theory of Solid Surfaces”, University Press, Cambridge 1979.Google Scholar
[10] Edwards, D. M., Mathon, J., and Wohlfarth, E. P., J. Phys. F 5 (1975) 1619.Google Scholar
[11] Mathon, J., J. Phys. F 16 (1986) L217.Google Scholar
[12] Dowben, P. A., Hürsch, W., and Landolt, M., J. Magn. Magn. Mater. 125 (1993) 120–124.Google Scholar
[13] Qi, Q.-N., Skomski, R., and Coey, J. M. D., J. Phys. CM 6 (1994) 3245.Google Scholar
[14] Jones, W. and March, N. H., “Theoretical Solid State Physics I”, Wiley, London 1973.Google Scholar
[15] Skomski, R. and Coey, J. M. D., “Permanent Magnetism”, Institute of Physics, Bristol 1999.Google Scholar