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Organic-Based Magnets: Opportunities in Photoinduced Magnetism, Spintronics, Fractal Magnetism, and Beyond

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Abstract

This article is based on a presentation on organic-based magnets given as part of Symposium X—Frontiers of Materials Research on December 4, 2002, at the 2002 Materials Research Society Fall Meeting in Boston. The advent of organicbased magnets opened the opportunity for tuning magnetic properties by molecular design and the discovery of new phenomena that rely on the internal structure of the molecules that make up these magnets. In the past 18 years, numerous classes of organic-based ferromagnets, ferrimagnets, and spin glasses (spins essentially frozen in place without long-range order) have been reported. These materials have magnetic ordering temperatures ranging from >1 K to above room temperature and demonstrate many of the magnetic properties associated with conventional magnets. This article concentrates on new phenomena that are unique to organic-based magnets. Three of these effects—“high-temperature” light-induced magnetism, spin-polarized magnetic organic semiconductors with the potential for spintronics, and the development of fractal magnetic order—are discussed to illustrate the richness of opportunity in organic-based magnets.

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Arthur J. Epstein is a Distinguished University Professor in the Department of Physics and the Department of Chemistry at the Ohio State University. Prior to joining OSU in 1985, he was a principal scientist at Xerox Corporation’s Webster Research Center. His interests include experimental and theoretical studies of magnetic and electronic polymers and their applications. He is co-discoverer of the first organicbased ferromagnet. Epstein’s seminal studies have shown that organic-based materials can have a wide range of conventional and previously unknown magnetic states.

Epstein received a BS degree from the Polytechnic Institute of Brooklyn in 1966 and a PhD degree in physics from the University of Pennsylvania in 1971. He is a fellow of the American Physical Society and a recipient of the Distinguished Scholar Award of OSU. He has authored more than 600 publications, has been granted more than 25 patents, has co-edited a number of major conference proceedings, is editor-in-chief of the journal Synthetic Metals, and has given numerous invited talks at international conferences. He has mentored more than 30 students to the PhD degree since joining OSU. Epstein can be reached by e-maul at epstein@mps.ohio-state.edu.

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Epstein, A.J. Organic-Based Magnets: Opportunities in Photoinduced Magnetism, Spintronics, Fractal Magnetism, and Beyond. MRS Bulletin 28, 492–499 (2003). https://doi.org/10.1557/mrs2003.145

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