AVS 65th International Symposium & Exhibition
    Magnetic Interfaces and Nanostructures Division Friday Sessions
       Session MI+EM-FrM

Paper MI+EM-FrM8
Controlling Antiferromagnetic Order at the Surface of La doped BiFeO3

Friday, October 26, 2018, 10:40 am, Room 203A

Session: Magnetism and Spin-Orbit Coupling at Surfaces, Interfaces and Thin Films
Presenter: Hendrik Ohldag, SLAC National Accelerator Laboratory
Authors: H. Ohldag, SLAC National Accelerator Laboratory
B.-K. Jang, Korea Advanced Institute of Science and Technology
J.H. Lee, Korea Advanced Institute of Science and Technology, Republic of Korea
K-E. Kim, Korea Advanced Institute of Science and Technology, Republic of Korea
H. Jang, SLAC National Accelerator Laboratory
K.-T. Ko, Max Planck Institute for Chemical Physics of Solids
M.H. Jung, Pohang University of Science and Technology, Republic of Korea
T.Y. Koo, Pohang Light Source
Y.H. Jeong, Pohang University of Science and Technology, Republic of Korea
J.-S. Lee, SLAC National Accelerator Laboratory
C-H. Yang, Korea Advanced Institute of Science and Technology, Republic of Korea
Correspondent: Click to Email

Emergence of a triple phase point in two dimensional (e.g. pressure and temperature) space can offer useful opportunities for the inter-coupling of two seemingly independent order parameters because of phase proximity. To illustrate the significance of this potential capability we employ a generic concept regarding electric control of magnetic order by manipulating chemical pressure: i.e. lanthanum substitution into the model antiferromagnetic ferroelectric BiFeO3. Our results are made possible by the remarkable finding that a multiferroic triple phase point of a single spin disordered phase and two spin ordered phases emerges near room temperature in Bi0.9La0.1FeO3ferroelectric thin films. By using spatially resolved x-ray absorption spectroscopy, we provide direct evidence that electric poling of a particular region of the compound near the triple phase point results in an antiferromagnetic phase while adjacent un-poled regions remain magnetically disordered, opening a promising avenue for magnetoelectric applications at room temperature.