Since then, technologists have improved the effect, and it is now widely used to detect the tiny patches of magnetism that store information on high-density disk drives.

从那时起，技术人员不断地完善这个技术的效果，现在被广泛用于检测在高密度磁盘驱动器中存储信息的微小磁性小块。

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It is also a vital component of high-voltage wires, magnetic coatings for high-density hard disk drives, fiber optics, fiberglass, catalytic converters and spark plugs.

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