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Landau–Lifshitz model : ウィキペディア英語版 | Landau–Lifshitz model
In solid-state physics, the Landau–Lifshitz equation (LLE), named for Lev Landau and Evgeny Lifshitz, is a partial differential equation describing time evolution of magnetism in solids, depending on 1 time variable and 1, 2, or 3 space variables. ==Landau–Lifshitz equation== The LLE describes an anisotropic magnet. The equation is described in as follows: It is an equation for a vector field S, in other words a function on R1+''n'' taking values in R3. The equation depends on a fixed symmetric 3 by 3 matrix ''J'', usually assumed to be diagonal; that is, . It is given by Hamilton's equation of motion for the Hamiltonian : ■ウィキペディアで「Landau–Lifshitz model」の詳細全文を読む
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