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Theory of Spin-Waves in a Disordered Heisenberg Ferromagnet

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Book cover Amorphous Magnetism

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Abstract

The pair-theory of the coherent potential approximation in the presence of off-diagonal randomness (CPA-ODR) has been applied to a disordered spin-1/2 Heisenberg ferromag-netic binary alloy. The spin-wave Green’s function has been evaluated in the random phase approximation and the randomly varying exchange interaction has been treated in the CPAODR. The density of spin-wave states (DSWS) has been calculated for a bcc lattice for the entire range of impurity concentrations. It is found that the general effect of disorder is to remove the singularities, modify the band width and introduce an additional structure in the DSWS. The ferromagnetic Curie temperature Tc for all impurity concen-trations has also been investigated. For impurities which are ferromagnetic in nature, the results from the present theory are found to be close to those obtained from the mean field theory.

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References

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Author information

Authors and Affiliations

  1. Department of Physics, Drexel University, Philadelphia, Pennsylvania, 19104, USA

    S. M. Bose

  2. Applied Physics Laboratory, The Johns Hopkins University, Silver Spring, Maryland, 20910, USA

    K. Moorjani

  3. Department of Physics, The Catholic University of America, Washington, D. C., 20017, USA

    T. Tanaka

  4. Harry Diamond Laboratories, Washington, D. C., 20438, USA

    M. M. Sokoloski

Authors
  1. S. M. Bose
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  2. K. Moorjani
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  3. T. Tanaka
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  4. M. M. Sokoloski
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Editor information

Editors and Affiliations

  1. Department of Physics, Wayne State University, Detroit, Michigan, USA

    Henry O. Hooper  & Adriann M. de Graaf  & 

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© 1973 Plenum Press

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Bose, S.M., Moorjani, K., Tanaka, T., Sokoloski, M.M. (1973). Theory of Spin-Waves in a Disordered Heisenberg Ferromagnet. In: Hooper, H.O., de Graaf, A.M. (eds) Amorphous Magnetism. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-4568-8_46

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  • DOI: https://doi.org/10.1007/978-1-4613-4568-8_46

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4613-4570-1

  • Online ISBN: 978-1-4613-4568-8

  • eBook Packages: Springer Book Archive

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