A Real-Space Phase Field Model for Domain Evolution of Ferromagnetic Materials
作者单位：Department of Engineering MechanicsZhejiang University
会议名称：《The 16th Annual Conference of Hong Kong Society of Theoretical and Applied Mechanics 2012、The 1st Mainland-Hong Kong Youth Forum on Mechanics 2012、The 8th Shanghai-Hong Kong Forum on Mechanics and Its Application 2012》
会议日期：2012年
学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：support from the Natural Science Foundation of China under Grants 11002123 and 11090333
关 键 词：Model A Real-Space Phase Field Model for Domain Evolution of Ferromagnetic Materials
摘 要：Ferromagnetic materials have been an important type of smart materials and are widely utilized in different magnetic devices due to their distinguished magneto-elastic coupling properties. The magneto-elastic coupling properties of ferromagnetic materials are dependent on the magnetic domain *** stable domain structures are determined by the competition between different energies of the materials,including the magnetocrystalline anisotropy energy,exchange energy (domain wall energy),elastic energy and magnetic *** study the domain structures of ferromagnetic materials,different phase field models have been developed in the literature[1].Most phase-field models in the literature employ the periodic boundary conditions,and thus the results are only valid when the simulation system size is much smaller than the actual sample size. In the present work,a real-space phase field model based on the time-dependent Ginzburg-Landau (TDGL) equation is developed to predict the domain evolution of ferromagnetic *** phase field model stems from a thermodynamic theory of ferromagnetic materials which employs the strain and magnetization as independent *** phase field equations are shown to reduce to the common micromagnetic model where the magnetostriction is absent and the magnitude of magnetization is *** strain and magnetization in the equilibrium state are obtained simultaneously by solving the phase field equations via a nonlinear finite element *** finite-element based phase field model is applicable for the domain evolution of ferromagnetic materials with arbitrary geometries and boundary *** evolution of magnetization domains in ferromagnetic thin film subjected to external stresses and magnetic fields are simulated and the magnetoelastic coupling behaviour is *** field simulations show that the magnetization vectors form a single magnetic vortex in ferromagnetic disks and *** configuration