Condensed-Matter Physics & Materials Science Seminar

"New routes to the electric-field control of magnetism"

Presented by Chun-Gang Duan, Key Laboratory of Polar Materials and Devices, East China Normal University, Shanghai, China

Thursday, June 28, 2012, 1:30 pm — Small Seminar Room, Bldg. 510

In this talk I will report our recent progresses in the first-principles studies on the new routes to the electric-field control of magnetism. We demonstrate that electric-field can be used directly or indirectly to change the magnetic properties of the material, through surface or interface magnetoelectric effect [1,2]. In addition, by replacing normal insulating layer with ferroelectrics in magnetic tunnel junctions (e.g., SrRuO3/BaTiO3/SrRuO3), we could design multiferroic tunnel junctions which combine the advantages of magnetic and ferroelectric tunnel junctions [3]. Furthermore, electric-field can also be used to control the magnetic orderings of multiferroic materials [4]. We also find that ferroelectricity can be induced by short-range magnetic exchange interaction, contrary to previous thoughts that magnetism and ferroelectricity tend to be mutually exclusive and interact weakly with each other when they coexist [5]. These results reveal exciting prospects of multiferroics and magnetoelectric materials for realistic application in multifunctional and low energy-cost electronic devices.

Hosted by: W. Yin

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