Advertisement

The Formation of the Magnetic Properties in Disordered Binary Alloys of Metal-Metalloid Type

  • A. K. Arzhnikov
  • L. V. Dobysheva
Chapter
Part of the NATO Science Series book series (ASHT, volume 55)

Abstract

A theoretical description of the magnetic properties in disordered alloys Fe-M (M=A1, Si, Sn, Ga) on the basis of a two-band model of the Hubbard type is presented. It is shown that at T=0 the local magnetic moment is determined by the number of metalloid atoms in the nearest environment and weakly depends on the concentration, which allows to use the Jaccarino-Walker model for the description of the experimental results. The thermodynamical Stoner excitations have essential effect at high concentration of the metalloid. The spin density fluctuations should be taken into account in a calculation of the concentration dependence of the Curie temperature at low concentration. So, at all concentrations, the itinerant character of the magnetism of these alloys does not allow to use localized models.

Keywords

Curie Temperature Hubbard Model Local Magnetic Moment Charge Fluctuation Coherent Potential Approximation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Yelsukov, E.P., Voronina, E.V. and Barinov, V.A. (1992) Mossbauer study of magnetic properties formation in disordered Fe-Al alloys, J. Magn. Magn. Mater. 115, 271–280.ADSCrossRefGoogle Scholar
  2. 2.
    Perez Alcazar, G.A., Plascak, J.A. and Galvao de Silva, E. (1986) Site - diluted Izing model for the magnetic properties of Fe 1-q Al q, 0< q<0.5 alloys in disordered phase,Phys.Rev.B 34, 1940–1943.CrossRefGoogle Scholar
  3. 3.
    Elsukov, E.P., Barinov, B.A. and Konygin, G.U. (1986) The effect of order-disorder transition on the structural and magnetic properties of the BCC Fe-Si alloys Fis. Met. i Met. (Russian) 62, 719–723.Google Scholar
  4. 4.
    Eymery, J.P., Fnipiki, A., Denenot, M.F. and Krishuan, R. (1988) Magnetic properties of Fe60A140 films prepared by coevaporation, IEE Trans. Magn. 24, 1697–1700.ADSCrossRefGoogle Scholar
  5. 5.
    Besnus, M.J., Kerr, A. and Meyer, A.J.P. (1975) Magnetization of disordered cold-worked Fe-Al alloys up to 51 at.% Al, J.Phys.F: Met. Phys. 5, 2138–2147.ADSCrossRefGoogle Scholar
  6. 6.
    Kakehashi, Y. (1986) Degeneracy and quantum effects in Hubbard model, Phys.Rev. B 34 3243–3253.ADSGoogle Scholar
  7. 7.
    Shukla, P. and Wortis, M. (1980) Spin-glass behavior in iron-aluminum alloys. A microscopic model, Phys.Rev. B 21, 159–164.ADSGoogle Scholar
  8. 8.
    Grest, G.S. (1980) Monte Carlo study of the transition from a ferromagnet to a spin glass in Fe-Al alloys, Phys.Rev. B 21, 165–168.MathSciNetADSCrossRefGoogle Scholar
  9. 9.
    Chatham, H., Silva, E.G.da, Guenzburger, D. and Ellis, D.E. (1987) Electronic structure, magnetic properties, Mossbauer isomer shifts, and hyperfine fields of disordered Fe-rich Fe-Al alloys, Phys.Rev. B 35, 1602–1608.ADSGoogle Scholar
  10. 10.
    Dubiel, S.M. and Zinn, W. (1983) Spin and charge density changes in a — Fe on substituting its atoms by Al, Si, Sn and V, J. Magn. Magn. Mater. 31–34, 530–532.CrossRefGoogle Scholar
  11. 11.
    Shiga, M. and Nakamura, Y. (1976) Mossbauer study of bcc Fe-Al alloys near the critical concentration, J.Phys.Soc.Jap. 40, N5, 1295–1299.ADSCrossRefGoogle Scholar
  12. 12.
    Fallot, M. (1936) Ferromagnetisme des alliages de fer, Ann. Phys. 6, 305–387.Google Scholar
  13. 13.
    Parsons, D., Sucksmith, W. and Thompson J.E. (1958) The magnetization of cobalt - aluminium, cobalt - silicon, iron - aluminium and iron - silicon alloys, Phil. Mag. 3, 1174–1184.ADSCrossRefGoogle Scholar
  14. 14.
    Vincze, I. and Cser, L. (1972) Phys. Stat. Sol. (h) 50, 709.ADSCrossRefGoogle Scholar
  15. 15.
    Arais, S. (1965) Ferromagnetic Curie temperatures of iron solid solutions with germanium, sylicon, molybdenium and manganese, Phys. Stat. Sol. 11, 121–126.ADSCrossRefGoogle Scholar
  16. 16.
    Pepperhoff, W. and Ettwig, H.-H. (1967) Tiber die spezifischen Warmen von Eisen - Silizium - Legierungen, Z. Phys. 22, 496–499.Google Scholar
  17. 17.
    Meinhardt, D. and Krisement, O. (1965) Fernordnung im System Eisen - Silicium, Arch. Eisenhuttenw. 36, 293–297.Google Scholar
  18. 18.
    Elsukov, E.P., Konygin, G.N., Barinov, V.A. and Voronina, E.V. (1992) Local atomic environment parameters and magnetic properties of disordered crystalline and amorphous iron-silicon alloys, J. Phys.: Cond. Matt. 4, 7597–7606.ADSCrossRefGoogle Scholar
  19. 19.
    Arzhnikov, A.K., Dobysheva, L.V., Yelsukov, E.P. and Zagaynov, A.V. (1996) Concentration dependence of the magnetization and the Curie temperature in disordered Fe-M alloys (M=A1, Si, Sn), JETP 83, 623–627.ADSGoogle Scholar
  20. 20.
    Moriya, T. (1987) Spin Fluctuations in Itinerant Electron Magnetism, Springer-Verlag, New York.Google Scholar

Copyright information

© Springer Science+Business Media Dordrecht 1998

Authors and Affiliations

  • A. K. Arzhnikov
    • 1
  • L. V. Dobysheva
    • 1
  1. 1.Physical-Technical InstituteUral Branch of Russian Academy of SciencesIzhevskRussia

Personalised recommendations