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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 Saturation (magnetic) ： ウィキペディア英語版 Saturation (magnetic) Seen in some magnetic materials, saturation is the state reached when an increase in applied external magnetic field ''H'' cannot increase the magnetization of the material further, so the total magnetic flux density ''B'' more or less levels off. (It continues to increase very slowly due to the vacuum permeability.) Saturation is a characteristic of ferromagnetic and ferrimagnetic materials, such as iron, nickel, cobalt and their alloys. ==Description== Saturation is most clearly seen in the ''magnetization curve'' (also called ''BH'' curve or hysteresis curve) of a substance, as a bending to the right of the curve (see graph at right). As the ''H'' field increases, the ''B'' field approaches a maximum value asymptotically, the saturation level for the substance. Technically, above saturation, the ''B'' field continues increasing, but at the paramagnetic rate, which is 3 orders of magnitude smaller than the ferromagnetic rate seen below saturation. The relation between the magnetizing field ''H'' and the magnetic field ''B'' can also be expressed as the magnetic permeability: $\backslash mu\; =\; B\; /\; H$ or the ''relative permeability'' $\backslash mu\_r\; =\; \backslash mu/\backslash mu\_0$, where $\backslash mu\_0$ is the vacuum permeability. The permeability of ferromagnetic materials is not constant, but depends on ''H''. In saturable materials the relative permeability increases with ''H'' to a maximum, then as it approaches saturation inverts and decreases toward one.〔 Different materials have different saturation levels. For example, high permeability iron alloys used in transformers reach magnetic saturation at 1.6 - 2.2 teslas (T), whereas ferrites saturate at 0.2 - 0.5 T. Some amorphous alloys saturate at 1.2-1.3 T. Mu-metal saturates at around 0.8 T.〔(【引用サイトリンク】title=Shielding Materials )〕〔(【引用サイトリンク】title=Mumetal is one of a family of three Nickel-Iron alloys )〕 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「Saturation (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.