Hydrodynamic collective modes and time-dependent correlation functions of a multicomponent ferromagnetic mixture

Dynamic properties of multicomponent mixtures of magnetic and non-magnetic particles were considered. We start from the general case of a multicomponent mixture, some components of which possess a magnetic momentum, being described by m + 2 parameters of abbreviated description. The equations of gen...

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Bibliographic Details
Published in:Journal of molecular liquids 2001-09, Vol.93 (1), p.119-122
Main Authors: Batsevych, O.F., Mryglod, I.M., Rudavskii, Yu.K., Tokarchuk, M.V.
Format: Article
Language:English
Subjects:
collective mode
hydrodynamics
multicomponent mixtures
time correlation function
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Summary:Dynamic properties of multicomponent mixtures of magnetic and non-magnetic particles were considered. We start from the general case of a multicomponent mixture, some components of which possess a magnetic momentum, being described by m + 2 parameters of abbreviated description. The equations of generalized hydrodynamics and those for time correlation functions are derived. Then we calculate eigenvalues of the hydrodynamic equations for small wave-number k, which yielded sound velocity and sound damping coefficients for two propagating modes, and damping coefficients for the rest modes which are purely diffusive. The scheme, which allows us to obtain weight coefficients for time correlation functions is proposed. Expressions for time correlation functions are analyzed for the paramagnetic case, when the coupling between the spin and fluid degrees of freedom can be neglected.
ISSN:0167-7322
1873-3166
DOI:10.1016/S0167-7322(01)00217-3