Behavior of the Interface in a Magnetic Alloy

概要

論文の詳細を見る
Computer simulation is carried out to study behavior of the interface through the whole course of spinodal decomposition in a magnetic binary alloy under the boundary condition that direction of the flat interface is specified. Before a smooth interface (density curve) is formed, clustering becomes dominant in the movement of atoms, at an early stage of decomposition, to result in a large fluctuation of density profile. Surface roughening occurs at the critical temperature of phase separation. Structure function S(k, t) defined on each layer is regarded as a sensitive quantity to characterize the surface property. Surface roughness R, diffuseness D, thickness L and the second moment m_2 with respect to the center of the interface profile are studied through the course of decomposition; R∼(T_c-T)^<-0.51>, D∼(T_c-T)^<-0.47>, L∼(T_c-T)^<-0.71> and m_2∼(T_c-T)^<-0.54> in equilibrium. The surface profile at low temperatures may be approximated well either by tanh az or by erf bz within the accuracy of the simulation. As far as the present results are concerned, the magnetic interaction is found to affect little on the critical property of spinodal decomposition except the raising of the critical temperature.
理論物理学刊行会の論文
1980-04-25