A Green function theory of spin waves in randomly disordered magnetic systems. I. The ferromagnet
- 7 October 1971
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 4 (14) , 2109-2126
- https://doi.org/10.1088/0022-3719/4/14/026
Abstract
The authors present a new technique for discussing the behaviour of spin waves in a ferromagnetically ordered system where the spins occupy random positions on a lattice. It is shown how a Hamiltonian and Green function appropriate to this random ferromagnet may be set up and used to describe the dynamics of such a system. An approximate evaluation of the averaged Green function gives the renormalization and damping of a spin wave mode due to disorder. An estimate of the critical concentration of the spin system is then given, and the authors conclude with a discussion of the effects of disorder on the spectral density function and density of states.Keywords
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