標題: Manipulating magnetoelectric energy landscape in multiferroics
作者: Huang, Yen-Lin
Nikonov, Dmitri
Addiego, Christopher
Chopdekar, Rajesh, V
Prasad, Bhagwati
Zhang, Lei
Chatterjee, Jyotirmoy
Liu, Heng-Jui
Farhan, Alan
Chug, Ying-Hao
Yang, Mengmeng
Ramesh, Maya
Qiu, Zi Qiang
Huey, Bryan D.
Lin, Chia-Ching
Gosavi, Tanay
Iniguez, Jorge
Bokor, Jeffrey
Pan, Xiaoqing
Young, Ian
Martin, Lane W.
Ramesh, Ramamoorthy
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 5-Jun-2020
摘要: Magnetoelectric coupling at room temperature in multiferroic materials, such as BiFeO3, is one of the leading candidates to develop low-power spintronics and emerging memory technologies. Although extensive research activity has been devoted recently to exploring the physical properties, especially focusing on ferroelectricity and antiferromagnetism in chemically modified BiFeO3, a concrete understanding of the magnetoelectric coupling is yet to be fulfilled. We have discovered that La substitutions at the Bi-site lead to a progressive increase in the degeneracy of the potential energy landscape of the BiFeO3 system exemplified by a rotation of the polar axis away from the < 111 > (pc) towards the < 112 > (pc) discretion. This is accompanied by corresponding rotation of the antiferromagnetic axis as well, thus maintaining the right-handed vectorial relationship between ferroelectric polarization, antiferromagnetic vector and the Dzyaloshinskii-Moriya vector. As a consequence, La-BiFeO3 films exhibit a magnetoelectric coupling that is distinctly different from the undoped BiFeO3 films. BiFeO3 has a wide application but the impact of rare-earth substitution for the evolution of the coupling mechanism is unknown. Here, the authors reveal the correlation between ferroelectricity, antiferromagnetism, a weak ferromagnetic moment, and their switching pathways in La-substituted BiFeO3.
URI: http://dx.doi.org/10.1038/s41467-020-16727-2
http://hdl.handle.net/11536/154548
ISSN: 2041-1723
DOI: 10.1038/s41467-020-16727-2
期刊: NATURE COMMUNICATIONS
Volume: 11
Issue: 1
起始頁: 0
結束頁: 0
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