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Condensed Matter Seminars
| Condensed Matter
Monday, January 26, 2009
Physics Building, Room 204
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[Host: Despina Louca]
"Combining ferroelectricity and magnetism: the low-energy electrodynamics"
Multiferroics, materials with coexisting magnetic and ferroelectric orders, hold the promise of implementing multifunctional devices, for example, an electric-write magnetic-read memory element. The success of this venture depends on our fundamental understanding of magnetoelectric coupling – the interaction that mixes magnetism with ferroelectricity. Although the electrical switching of a magnetic domain has yet to be achieved, various degrees of electric control of magnetism and magnetic control of ferroelectric state have been demonstrated. Magnetic and lattice vibrations and their mixing by the magnetoelectric coupling play a central role in the properties of multiferroics. This low-energy electrodynamics can help unravel the fundamental interactions between magnetic and lattice degrees of freedom. I will present a study of long-wavelength magnetic excitations in several important classes of multiferroics and demonstrate the relationship between the magnetic excitations and the materials’ magnetoelectric functionality.
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