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Advancement of automotive electronic technology is leading to a greater use of permanent magnet materials. New vehicle specifications demand sensors and D.C. motors to be lighter and more efficient. Magnet manufacturers are developing materials and processes to meet these needs, both for the present and the future. Permanent magnets today are used in a wide range of industrial, domestic, automotive and aerospace applications. Their special, technological importance derives from their ability to act contactlessly on ferromagnetic material, either by attraction or repulsion, and to provide a permanent magnetic flux with no energy input and, hence, at no operating cost. The current usage of permanent magnets in domestic applications averages 50 per household in the United States, as illustrated in Figure 1. Perhaps the most surprising range of permanent magnet uses are the numerous applications in a modern passenger vehicle.