Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2007-11-27
Physics
Condensed Matter
Other Condensed Matter
11 pages, 7 figures, MikTEX
Scientific paper
10.1103/PhysRevB.77.064402
We develop a consistent semiclassical theory of spin dynamics for an isotropic ferromagnet with a spin $ S=1$ taking into consideration both bilinear and biquadratic over spin operators exchange interaction. For such non-Heisenberg magnets, a peculiar class of spin oscillations and waves, for which the quantum spin expectation value $ {\rm {\bf m}}=<{\rm {\bf S}}>$ does not change it direction, but changes in length, is presented. Such ``longitudinal'' excitations do not exist in regular magnets, dynamics of which are described in terms of the Landau-Lifshitz equation or by means of the spin Heisenberg Hamiltonian. We demonstrate the presence of non-linear uniform oscillations and waves, as well as self-localized dynamical excitations (solitons) with finite energy. A possibility of excitation of such oscillations by ultrafast laser pulse is discussed.
Galkin Yu. A.
Ivanov Boris A.
Khymyn R. S.
Merkulov Yu. A.
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