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MA: Magnetismus

MA 22: Internal Symposium “50 Years AG Magnetism”

MA 22.2: Hauptvortrag

Mittwoch, 29. März 2006, 15:45–16:15, HSZ 03

Making magnets harder — •J. M. D. Coey — School of Physics and CRANN, Trinity College, Dublin 2, Ireland

The 20th century was a period when the energy product of permanent magnets, the simplest figure of merit, improved exponentially. This growth is now over, and the prospects of another doubling look dim. Permanent magnets however have myriad uses in electromagnetic drives, and hundreds of millions of them are produced annually. Further progress may come from integrating micron-scale magnets into silicon-based MEMS structures, especially in view of the favorable scaling of dipole-dipole interactions. Current challenges to produce useful magnetic thick films will be discussed, and potential for further materials development will be reviewed.