8.10 Applications of Magnets in Recording Technology
Electromagnets are widely used in recording technology of sound, video, and data in the form of electrical signals through magnetization of a magnetic material. Most common magnetic recording media are magnetic tapes and disk recorders, which are used not only to reproduce audio and video signals but also to store computer data. These materials are usually coated with iron oxide. Some other recording media are magnetic drums, ferrite cores, and magnetic bubble memory.