Electromagnon excitations in multiferroics
DIPC Seminars
- Speaker
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Rogério de Sousa, Department of Physics and Astronomy, University of Victoria, B.C., Canada
- When
-
2011/05/05
14:00 - Place
- Donostia International Physics Center (DIPC).Paseo Manuel de Lardizabal, 4 (nearby the Facultad de Quimica), Donostia
- Add to calendar
-
iCal
The coexistence of ferroelectricity and magnetism in multiferroic
materials gives rise to cross-correlation between electric and
magnetic degrees of freedom. A notable consequence is that the
elementary excitations are not purely magnetic or ferroelectric in
character: The spin waves are admixed with vibrational modes of the
electric polarization, giving rise to electric dipole active magnons,
the so-called electromagnons. Electromagnons are particularly
interesting in the room temperature multiferroic BiFeO3, that exhibits
a large ferroelectric moment coexisting with a spiral magnetic phase
in the form of a cycloid. A recent experiment demonstrated gigantic
electric-field tuning of these excitations, three orders of magnitude
larger than previous measurements in other materials. The origin of
this amazing electric-field control lies in the sensitivity of the
cycloid magnet to an external electric field.
Contact person at DIPC: Ivo Souza (ivo_souza@ehu.es)
Would you want to schedule to meet with the speaker, please
contact Dr. Souza who will put together the schedule of the visit.