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Lecture Andrei Pimenov

Rooster

WanneerWaar
13 maart 2009 FWN-Building 5116.0116, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Andrei Pimenov
Affiliation: University of Würzburg, Germany
Title: Magnetic and mangetoelectric excitations in multiferroics
Date: Fri Mar 13, 2009
Start: 11.00
Location: FWN-Building 5118.-156
Host: M. Mostovoy
Telephone: +31 50 363 3419

Abstract

Multiferroics are materials simultaneously showing ferromagnetic and ferroelectric order. Two order parameters are coupled in multiferroics, which leads to such unusual effects like magnetic switching of electric polarization and dielectric constant. As can be expected already from the first principles, changes in the static properties of multiferroics must be accompanied by dynamic effects like characteristic magnetoelectric excitations. Indeed, such excitations could be recently observed in the spectra and were called electromagnons. Contrary to the conventional magnons, the electromagnons are excited by the electric component of the electromagnetic wave and contribute to the static dielectric permittivity. The suppression of electromagnons in external magnetic fields provides a natural explanation for the magnetoelectric effects in broad frequency range between dc and terahertz.

Laatst gewijzigd:22 oktober 2012 14:30