A Survey of the Current State-of-the-Art in High-Energy-Product Permanent Magnets

Abstract : The current state-of-the-art of high energy permanent magnets (HEPM, with (BH max) > or = 10MGOe) was surveyed to inform design engineers about presently available magnetic material types. Users of HEPM's were asked to provide information about their current and future requirements on the properties of permanent magnets for their devices. The responses were divided into six application categories, and are presented in the form of 'specifications'. An up-to-date list of HEPM manufacturers, their addresses, and a summary of the materials they make is included, and cross-referenced. A functioning prototype fixture was built to perform demagnetization curve testing at temperature between -197 and +300C. Design considerations are discussed. Example demagnetization curve sets as functions of temperature were measured and are presented.