Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session P40: Domain Walls
3:00 PM–6:00 PM,
Wednesday, March 17, 2021
Sponsoring
Units:
GMAG DMP
Chair: Alexey Kovalev, University of Nebraska - Lincoln
Abstract: P40.00007 : Dynamics of Muliferroic Domain Wall in an External Field
4:36 PM–4:48 PM
Live
Presenter:
Koji Kawahara
(ISSP, The University of Tokyo)
Authors:
Koji Kawahara
(ISSP, The University of Tokyo)
Hirokazu Tsunetsugu
(ISSP, The University of Tokyo)
We have studied the dynamics of composite DW in GdFeO3 driven by either magnetic or electric field based on the time-dependent Ginzburg-Landau equations [2]. One of the two major findings is about the scaling of DW mobility with field strength. The scaling differs between magnetic and electric field drives, and this is due to a parasitic nature of electric polarization. The second finding is the instability of a composite DW, and it splits into a pair of other types of DWs when a driving field exceeds a critical value. This originates in the deformation of DW internal structure, and thus is an
intrinsic dynamical instability. Phase diagram of DW stability is determined in the space of applied field and strength of order parameter interaction.
[1] Y. Tokunaga et al., Nature Mater 8, 558 (2009)
[2] K. Kawahara and H. Tsunetsugu, arXiv:2008.08600, in press in J. Phys. Soc. Jpn.
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