A phenomenon in which a time delay occurs in the change in magnetization when an external magnetic field applied to a ferromagnetic material is changed. Even in the case of AC magnetization caused by an AC magnetic field with a frequency of ω, this appears as a phase delay in the magnetization, causing energy loss. The time delay in this case is about ω -1 . There are two types of magnetic aftereffects: the diffusion magnetic aftereffect caused by the diffusion of atoms within the lattice as the boundaries of magnetic domains move, and the thermal fluctuation magnetic aftereffect caused by the fluctuation of ferromagnetic spins within small particles due to thermal vibration. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
強磁性体に加わる外部磁界を変化させたときに,磁化の変化が時間的な遅れを生じる現象。振動数 ω の交流磁場による交流磁化においても,磁化の位相の遅れとして現れ,エネルギー損失の原因となる。このときの時間的遅れは ω-1 程度である。磁気余効には磁区の境界の移動に伴う原子の格子内拡散による拡散磁気余効と,小さい粒子内で強磁性スピンが熱振動によりゆらいでいるために生じる熱ゆらぎ磁気余効とがある。
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