Dresden 2011 – wissenschaftliches Programm
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KR: Fachgruppe Kristallographie
KR 4: Multiferroics IV (Joint Session of MA, DF, DS, KR, TT)
KR 4.5: Vortrag
Dienstag, 15. März 2011, 11:45–12:00, HSZ 04
Time resolved measurements of the multiferroic switching in MnWO4 — •Max Baum1, Thomas Finger1, Jeannis Leist2, Karin Schmalzl3, Louis-Pierre Regnault4, Petra Becker5, Ladislav Bohatý5, and Markus Braden1 — 1II. Physikalisches Institut, Universität zu Köln — 2Institut für Physikalische Chemie, Georg-August-Universität Göttingen — 3Jülich Centre for Neutron Science (JCNS) at ILL, Grenoble — 4Institut Nanosciences et Cryogénie, CEA-Grenoble — 5Institut für Kristallographie, Universität zu Köln
Multiferroic materials or compounds with a strong magnetoelectric effect posses a large application potential in data storage techniques. Quite recently, systems with a peculiar spiral magnetic order were shown to directly induce a spontaneous electric polarisation and to exhibit giant magnetoelectric and magnetocapacitance effects, among them MnWO4. Neutron scattering with spherical polarisation analysis gives direct access to the chiral component of the magnetic structure which is directly linked to the electric polarisation and thus may be tunable by an electric field. In MnWO4 it is possible to drive multiferroic hysteresis loops at constant temperature as a function of the electric field. We broadened our investigations in this topic and present time resolved measurements of magnetoelectric switching. We applied stroboscopic techniques in order to investigate how fast the chiral component of the magnetic structure adapts to an instantaneously switched electric field. The time scale of the response is remarkable slow, in the range of 3 - 20 ms.