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    A Survey of Magnetic Materials (NOT KNOWN IF PUBLISHED BECAUSE AUTHOR HAS LEFT AT&T)

A Survey of Magnetic Materials (NOT KNOWN IF PUBLISHED BECAUSE AUTHOR HAS LEFT AT&T)

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Magnetic materials are generally divided into three classes: soft magnetic materials with coercivity less than about 10 A/cm, hard magnetic materials with coercivity above 100 A/cm, and semi-hard magnetic materials with coercivity between 10 and 100 A/cm. Soft magnetic materials include low- carbon steel, silicon steel, nickel-iron alloys, cobalt-iron alloys, and spinel ferrites. Hard magnetic materials include alnicos, hexagonal ferrites, cobalt rare-earths, chromium-cobalt-iron alloys, and more recently, neodymium-iron-boron alloys. Semi-hard magnetic materials include cobalt-iron- vanadium alloys. Fine particles and continuous films, with coercivities in the range of 250 to 1000 A/cm, are used as magnetic recording media. This paper will provide a general survey, with additional emphasis on current and future trends on magnetic materials development and usage.