Demagnetizing field

Japanese: 反磁場 - はんじば（英語表記）demagnetizing field

When a ferromagnetic material of finite size is placed in a magnetic field and magnetized, a magnetic field in the opposite direction appears inside the material due to the magnetic poles created at both ends of the material as a result of the magnetization. The strength of the demagnetizing field _Hd is proportional to the strength of magnetization M and can be written as _Hd = NM / _μ0 , where _μ0 is the magnetic permeability of a vacuum and N is a proportionality constant called the demagnetizing factor.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

有限の大きさをもつ強磁性体を磁場中に入れて磁化するとき，磁化のためにその両端に生じた磁極によって強磁性体内に現れる逆向きの磁場。反磁場の強さ H_d は磁化の強さ M に比例し，H_d＝NM/μ₀ と書ける。 μ₀ は真空の透磁率，N は反磁場係数と呼ばれる比例定数である。

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