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Open Access Publications from the University of California

Manipulating magnetoelectric energy landscape in multiferroics.

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

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.

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