What is the advantage of higher coercivity in magnet?
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The advantage of these materials over the borides is twofold: it is possible to develop high coercivities without recourse to special processing, such as powder metallurgy.
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Magnetic hysteresis occurs when an external magnetic field is applied to a ferromagnetsuch 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. To demagnetize it requires heat or a magnetic field in the opposite direction. This is the effect that provides the element of memory in a hard disk drive.
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