Present and Future Applications of High-Coercive-Force Magnets

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Abstract
High‐coercive‐force magnets are unique in their ability to retain a useful level of magnetization in demagnetizing fields that approach, equal, or exceed the magnitude of their residual induction (in cgs system units). Their usefulness is enhanced by excellent recoil properties and low flux leakage. Magnets in this category include the barium/strontium ferrites, platinum cobalt, and the rare earth‐cobalts. Their residual inductions range from 3,000 to 10,000 Gauss and their intrinsic coercive forces from 3,000 to 30,000 Oersteds. Important existing applications include focusing magnets in tubes, rotor or stator magnets in electrical machinery, and lifting and holding magnets. Future applications of significant potential include passive frictionless suspension for tracked ground transportation vehicles, and low‐power, long‐lived, friction‐free bearings for spacecraft systems.

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