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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 Single domain (magnetic) ： ウィキペディア英語版 Single domain (magnetic) Single domain, in magnetism, refers to the state of a ferromagnet〔in the broader meaning of the term that includes ferrimagnetism.〕 in which the magnetization does not vary across the magnet. A magnetic particle that stays in a single domain state for all magnetic fields is called a single domain particle (but other definitions are possible; see below).〔Superparamagnetic particles are often called single-domain as well because they behave like a paramagnet with a single large spin.〕 Such particles are very small (generally below a micrometre in diameter). They are also very important in a lot of applications because they have a high coercivity. They are the main source of hardness in hard magnets, the carriers of magnetic storage in tape drives, and the best recorders of the ancient Earth's magnetic field (see paleomagnetism). == History == Early theories of magnetization in ferromagnets assumed that ferromagnets are divided into magnetic domains and that the magnetization changed by the movement of domain walls. However, as early as 1930, Frenkel and Dorfman predicted that sufficiently small particles could only hold one domain, although they greatly overestimated the upper size limit for such particles. The possibility of single domain particles received little attention until two developments in the late 1940s: (1) Improved calculations of the upper size limit by Kittel and Néel, and (2) a calculation of the magnetization curves for systems of single-domain particles by Stoner and Wohlfarth. The Stoner–Wohlfarth model has been enormously influential in subsequent work and is still frequently cited. 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「Single domain (magnetic)」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.