https://doi.org/10.1140/epjp/s13360-020-00327-6
Regular Article
Modulated and enhanced magnetoelectric coupling in multiferroic [see pdf]
1
School of Physics and Electronics, North China University of Water Resources and Electric Power, Zhengzhou, 450045, China
2
Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
* e-mail: luoshijuncn@163.com
Received:
11
December
2019
Accepted:
11
March
2020
Published online:
2
April
2020
We investigate the effects of 
doping on the magnetism, ferroelectricity, and magnetoelectric coupling in the 
. The lower Co doping (at 
) suppresses the commensurate collinear antiferromagnetic phase (AF1 phase) and stabilizes the ferroelectric phase down to 
. For higher Co substitution levels 
and 0.07, the ferroelectric polarization P reaches a peak at 
and 
, respectively, and decreases to nonzero (measured at ) with further cooling, which can be attributed into a continuous rotation of the spiral plane driven by the small change in temperature. The polarization P at 
increases monotonically with cooling, which suggests the orientation of the spin helix unchanged. Ferroelectric polarization P reverses synchronously with the applying the cyclic oscillation external magnetic field and suggests that the polarization P is strongly coupled with the magnetism in the 
sample.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2020
