Manipulating magnetoelectric energy landscape in multiferroics

Yen Lin Huang, Dmitri Nikonov, Christopher Addiego, Rajesh V. Chopdekar, Bhagwati Prasad, Jyotirmoy Chatterjee, Lei Zhang, Heng-Jui Liu, Alan Farhan, Ying-Hao Chu, Mengmeng Yang, Maya Ramesh, Zi Qiang Qiu, Bryan D. Huey, Chia-Ching Lin, Tanay Gosavi, Jorge Íñiguez, Jeffrey Bokor, Xiaoqing Pan, Ian YoungLane W. Martin, Ramamoorthy Ramesh

Research output: Contribution to journalArticleScientificpeer-review

33 Citations (Scopus)
26 Downloads (Pure)

Abstract

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.

Original languageEnglish
Article number2836
JournalNature Communications
Volume11
Issue number1
DOIs
Publication statusPublished - 5 Jun 2020
MoE publication typeA1 Journal article-refereed

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