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Asked why ferromagnetic materials have memory function?

Magnetic recording materials such as magnetic tapes, magnetic heads, disks, and sounds generate waves that are converted into electrical signals or directly converted into electrical signals. Magnetic powder signals from magnetic tape or magnetic heads are combined with electrical signals. Iron oxides, whose hysteresis loops are rectangular in shape and are also called moment magnetic materials, have a remanence Br that is close to that of saturation, and when it is magnetized in both directions, the remanence is always at Br. Or -Br state, so it has memory.

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