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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Arrott plot ： ウィキペディア英語版 Arrott plot In condensed matter physics, an Arrott plot is a plot of the square of the magnetization $M^2$ of a substance, against the ratio of the applied magnetic field to magnetization $H/M$ at one (or several) fixed temperature(s). Arrott plots are an easy way of determining the presence of ferromagnetic order in a material.〔 〕〔 〕 They are named after American physicist Anthony Arrott who introduced them as a technique for studying magnetism in 1957.〔 〕 ==Details== According to the Ginzburg-Landau mean field picture for magnetism, the free energy of a ferromagnetic material close to a phase transition can be written as: $$ F(M)=-H M+a (T-T_c) M^2+bM^4+\ldots where $M$, the magnetization, is the order parameter, $H$ is the applied magnetic field, $T\_c$ is the critical temperature, and $a,b$ are arbitrary constants. Close to the phase transition, this gives a relation for the magnetization order parameter: $$ M^2=\frac\frac-\frac\epsilon where $\backslash epsilon=\backslash frac$ is a dimensionless measure of the temperature. Thus in a graph plotting $M^2$ vs. $H/M$ for various temperatures, the line without an intercept corresponds to the dependence at the critical temperature. Thus along with providing evidence for the existence of a ferromagnetic phase, the Arrott plot can also be used to determine the critical temperature for the phase transition.〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Arrott plot」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.