期刊
CERAMICS INTERNATIONAL
卷 47, 期 24, 页码 34028-34033出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.08.311
关键词
Magnetoelectric coupling; Electric field dependent magnetization; Polarization; Antiferromagnetism; Spin canting; Domain wall
资金
- National Natural Science Foundation of China [11904005]
- Natural Science Foundation of Guangxi [2019GXNSFBA245089]
- Guangxi Scientific Base & Talent Special Project [AD20297085]
- National Key Research and Development Pro-gram of China [2016YFB0700702]
In the honeycomb antiferromagnet Co4Nb2O9, the magnetoelectric (ME) coupling does not increase monotonously with the poling magnetic field strength, but reaches maxima around 10 kGs due to opposite dependences of domain wall thickness and energetically preferred domain's proportion on the poling magnetic field. Interestingly, ME coupling still exists when the sample returns to the paramagnetic phase after being poled and then reenters the antiferromagnetic phase without being poled, attributed to the presence of ME domain nucleation centers in the paramagnetic phase.
We have firstly studied the poling magnetic field dependence of magnetoelectric (ME) coupling in a honeycomb antiferromagnet Co4Nb2O9, and found that the ME susceptibilities do not increase monotonously with increasing the poling magnetic field strength (HPole) as the usual case, but reach maxima around 10 kGs. This phenomenon results from opposite HPole dependences of domain wall thickness and energitically preferred domain's proportion. More interestingly, if the sample returns to paramagnetic phase after being poled and then reenters antiferromagnetic phase without being poled, ME coupling still exists. This memory effect is attributed to the presence of ME domain nucleation centers in paramagnetic phase.
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