Abstract
A kinetic theory of ferromagnetic resonance in a suspension of nanoparticles with uniaxial anisotropy of arbitrary strength is proposed. The presented approach explicitly takes into account thermal fluctuations of magnetic moment for the dispersed particles and specifies the orientational distribution function of their anisotropy axes at any external field and temperature. The developed theory is used for studying the high-frequency response of a magnetic fluid at different temperatures. It is shown that in a certain temperature interval the absorption line splits into two components. The resonance field, corresponding to the first one, is almost temperature-independent and close to the value for an isotropic magnet. The second component appears only at reduced temperatures, when orientational texturing of the suspension occurs due to the action of magnetizing field. As the temperature of the system goes down, that latter component shifts towards lower fields. The width of this interval is essentially dependent on the magnitude of the particle anisotropy and the precession damping constant. Received 12 . 09 .2016; accepted 04 . 10 .2016
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