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

Paper MI+EM-FrM4
Transport and Magnetic Properties of LaAlO3/SrTiO3 Heterostructure during Cooling and Warming

Friday, October 26, 2018, 9:20 am, Room 203A

Session: Magnetism and Spin-Orbit Coupling at Surfaces, Interfaces and Thin Films
Presenter: Zengming Zhang, University of Science and Technology of China
Authors: Z.M. Zhang, University of Science and Technology of China
X.Q. Wang, University of Science and Technology of China
M. Zhang, University of Science and Technology of China
A. Rahman, University of Science and Technology of China
R.C. Dai, University of Science and Technology of China
Z.P. Wang, University of Science and Technology of China
Z.J. Ding, University of Science and Technology of China
L. Cheng, University of Science and Technology of China
Correspondent: Click to Email
The LaAlO3 thin films were grown on TiO2 terminated (001) SrTiO3 substrate using pulsed laser deposition technique. The transport and magnetic properties of LaAlO3/SrTiO3 (LAO/STO) heterostructure were studied during cooling and warming. The conductivity accelerated recoveries are found at around 70K and 160K for larger electrode interval of several mm, and more obvious for thicker LAO films. This indicated that the domain wall scale increases with the interface variation from fully strain state to partial strain state as the layers of LAO increase. During thermal cycling, both magnetoresistance(xx) and magnetization separate around the conductivity accelerated recovery temperature as seen in Fig. (c). The phenomenon is attributed to the mobile and trapping of defects such as single vacancy and divacancy by polarized domain walls due to the measuring current at the critical temperature [1-2].

References:

1. S. Seri et al, Interplay between sheet resistance increase and magnetotransport properties in LaAlO3 /SrTiO3, Phys. Rev. B 86, 085118 (2012).

2. S. Seri et al, Thermally activated recovery of electrical conductivity in LaAlO3/SrTiO3, Phys. Rev. B 87, 125110( 2013).