Dynamical Behavior of Antiferromagnetic Sublattice Magnetization Vectors. II

概要

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To study the motion of the sublattice magnetization vectors in the process of spin-flipping the phenomenological equation of motion including the Landau-Lifschitz damping term is integrated numerically for the case of an orthorhombic system CuCl_22H_2O and a similar system having a larger an isotropy energy, and also for the case of a uniaxial system MnF_2. In the case of small damping the sublattice magnetizations in an orthorhombic system rotate around tend to their equilibrium positions after infinite number of turns, but in the case of large damping they tend smoothly to the equilibrium positions without oscillatory motion. The sublattice magnetizations are almost confined in the easy plane when applied field is close to the spin-flip a small eigenoscillation is superposed on the large motion mentioned above. The motion in a uniaxial system differs in that the sublattice magnetization vectors do not easily move towards their equilibrium positions but they perform a spiral motion around an axis that is nearly perpendicular to the equilibrium direction, i.e. where the energy has its maximal value. Fox large damping the motion occurs nearly in a plane towards equilibrium direction.
社団法人日本物理学会の論文
1969-08-05