Philosophical Society of Washington

The Silent Revolution: Rare Earth Permanent Magnets and Their Applications

Fred Rothwarf
Applied Technologies Enterprises, Ltd.

2023rd Meeting Abstract
Friday, February 04, 1994 at 8:15 PM


Radical developments have recently occurred in the field of permanent magnet (PM) materials. The advent of rare earth permanent magnet (REPM) materials has increased the highest energy products, (BH)max, available by a factor of over five and raised the intrinsic coercivity, Hci by an order of magnitude. Consequently, a dramatic, rapid expansion of PM use is now taking place. This is leading to the miniaturization of conventional devices and the evolution of new applications and design concepts. This talk will review the new developments in REPM materials and discuss some of the potential applications such as energy storage, magnetic fluid conditioning, and magnetic resonance microscopy.

About the Author:

Mr. Rothwarf earned an A.B. (Physics) in 1951, an A.M. (Physics) in 1953, and a Ph.D. (Solid State Physics) in 1960, all from Temple University. He completed postdoctoral studies in Superconductivity at the University of Paris, Orsay in 1966 under Professor P. G. DeGennes. He has worked at various U.S. Army laboratories and research offices as a solid state physicist and a Supervisory Materials Scientist. Mr. Rothwarf was the Materials Sciences Program Manager at the U.S. Army European Research Office from 1980 to 1984 and at the U.S. Army Research Office from 1984 to 1986. In 1984, he also co-founded the Advanced Materials Corporation. Mr. Rothwarf has served as Vice-President and Science Advisor for Virginia's Center for Innovative Technology from 1988 to 1991. In 1989, he founded Applied Technology Enterprises, Ltd of which he is currently the president. He is also a Visiting Professor at Drexel University. Mr. Rothwarf currently has eleven patents and 67 publications.

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