Manipulating magnetoelectric energy landscape in multiferroics

Yen-Lin Huang, Dmitri Nikonov, Christopher Addiego, Rajesh V. Chopdekar, Bhagwati Prasad, Lei Zhang, Jyotirmoy Chatterjee, 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 Young, Lane W. Martin and Ramamoorthy Ramesh ()
Additional contact information
Yen-Lin Huang: University of California, Berkeley
Dmitri Nikonov: Components Research, Intel Corp.
Christopher Addiego: University of California, Irvine
Rajesh V. Chopdekar: Lawrence Berkeley National Laboratory
Bhagwati Prasad: University of California, Berkeley
Lei Zhang: University of California, Berkeley
Jyotirmoy Chatterjee: University of California, Berkeley
Heng-Jui Liu: National Chung Hsing University
Alan Farhan: Aalto University School of Science
Ying-Hao Chu: National Chaio Tung University
Mengmeng Yang: University of California, Berkeley
Maya Ramesh: University of California, Irvine
Zi Qiang Qiu: University of California, Berkeley
Bryan D. Huey: University of Connecticut
Chia-Ching Lin: Components Research, Intel Corp.
Tanay Gosavi: Components Research, Intel Corp.
Jorge Íñiguez: Luxembourg Institute of Science and Technology (LIST), 5 avenue des Hauts-Fourneaux
Jeffrey Bokor: University of California, Berkeley
Xiaoqing Pan: University of California, Irvine
Ian Young: Components Research, Intel Corp.
Lane W. Martin: University of California, Berkeley
Ramamoorthy Ramesh: University of California, Berkeley

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-16727-2

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