Magnetic hysteresis

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What Wikipedia says

Magnetic hysteresis occurs when an external magnetic field is applied to a ferromagnet such as iron and the atomic dipoles align themselves with it. Even when the field is removed, part of the alignment will be retained: the material has become magnetized. Once magnetized, the magnet will stay magnetized indefinitely.

Excerpt from the Wikipedia article “Magnetic hysteresis”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: RockMagnetist, CC0, via Wikimedia Commons.