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 L40: Bulk Chiral Magnets
8:00 AM–11:00 AM,
Wednesday, March 17, 2021
Sponsoring
Units:
GMAG DMP
Chair: Shilei Zhang, Shanghai Tech
Abstract: L40.00012 : Multiferroic Crankshaft in GdMn2O5
10:36 AM–10:48 AM
Live
Presenter:
Louis Ponet
(Quantum Materials Theory, Istituto Italiano di Tecnologia)
Authors:
Louis Ponet
(Quantum Materials Theory, Istituto Italiano di Tecnologia)
Sergey Artyukhin
(Quantum Materials Theory, Istituto Italiano di Tecnologia)
Sang-Wook Cheong
(Center for Quantum Materials Synthesis, Rutgers University)
Andrei Pimenov
(Vienna Univ of Technology)
energy efficiency of magnetic memory and data processing devices. The
magnetoelectric switching requires more than just a coupling between spin and
charge degrees of freedom and is hard to achieve. We show that the application
and subsequent removal of magnetic field along a particular “magic” angle reverses
the electric polarization of the multiferroic GdMn2O5, induced by an
antiferromagnetic spin ordering. The polarization reversal appears together with an
unusual 4-state hysteresis cycle, in which one half of all spins undergoes a
unidirectional full-circle rotation in increments of ∼90 degrees.
GdMn2O5 thus resembles a microscopy magnetic analogue to a crankshaft,
converting the back and forth variations of the magnetic field into a circular spin
motion. The resulting magnetoelectric switching is independent of the sign of the
magnetic field and does not require magnetoelectric cooling. It is found that the 4-
state hysteresis regime emerges as a topologically distinct region (around the
magic angle) between two more regular 2-state hysteresis regions at high or low
field angles.
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