Document Type : Research
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Abstract
In this paper, we have studied the equations describing the proposed experimental Hamiltonian of a single-molecule magnet Fe8.
In this research, we used from coherent states in real parameter and Fayman path integral. These nonlinear equations fully described dynamic of this single-molecule magnet in Su (2) and Su (3) groups. The solutions of these equations are magnetic solitons (not calculated in this study). »Linear equations show that for this SMM, the mean square torque ( Quadrupole excitation) is not constant and its dynamic consists of two parts. One part, rotate around the classical spin vector and the other is related to changing the size of the quadrupole torque. The spin wave dispersion equation for dipole and quadruple branches is calculated for small linear excitations from ground state (vacuum). These equations show that, for dipole branch, the spin wave is damping away from the single-molecular magnet and oscillating and not damping for the quadrupole branch.
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