Manipulating magnetoelectric energy landscape in multiferroics

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Nature Communications, Volume 11
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.
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Huang, Y L, Nikonov, D, Addiego, C, Chopdekar, R V, Prasad, B, Chatterjee, J, Zhang, L, Liu, H-J, Farhan, A, Chu, Y-H, Yang, M, Ramesh, M, Qiu, Z Q, Huey, B D, Lin, C-C, Gosavi, T, Íñiguez, J, Bokor, J, Pan, X, Young, I, Martin, L W & Ramesh, R 2020, ' Manipulating magnetoelectric energy landscape in multiferroics ', Nature Communications, vol. 11, no. 1, 2836 .