Discovery of a magnetic conductive interface in PbZr0.2Ti0.8O3 /SrTiO3 heterostructures

Yi Zhang, Lin Xie, Jeongwoo Kim, Alex Stern, Hui Wang, Kui Zhang, Xingxu Yan, Linze Li, Henry Liu, Gejian Zhao, Hang Chi, Chaitanya Gadre, Qiyin Lin, Yichun Zhou, Ctirad Uher, Tingyong Chen, Ying-Hao Chu, Jing Xia, Ruqian Wu and Xiaoqing Pan ()
Additional contact information
Yi Zhang: University of California
Lin Xie: Nanjing University
Jeongwoo Kim: University of California
Alex Stern: University of California
Hui Wang: University of California
Kui Zhang: University of California
Xingxu Yan: University of California
Linze Li: University of California
Henry Liu: National Chiao Tung University
Gejian Zhao: Arizona State University
Hang Chi: University of Michigan
Chaitanya Gadre: University of California
Qiyin Lin: University of California
Yichun Zhou: Xiangtan University
Ctirad Uher: University of Michigan
Tingyong Chen: Arizona State University
Ying-Hao Chu: National Chiao Tung University
Jing Xia: University of California
Ruqian Wu: University of California
Xiaoqing Pan: University of California

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Emergent physical properties often arise at interfaces of complex oxide heterostructures due to the interplay between various degrees of freedom, especially those with polar discontinuities. It is desirable to explore if these structures may generate pure and controllable spin currents, which are needed to attain unmatched performance and energy efficiency in the next-generation spintronic devices. Here we report the emergence of a spin-polarized two-dimensional electron gas (SP-2DEG) at the interface of two insulators, SrTiO3 and PbZr0.2Ti0.8O3. This SP-2DEG is strongly localized at the interfacial Ti atoms, due to the interplay between Coulomb interaction and band bending, and can be tuned by the ferroelectric polarization. Our findings open a door for engineering ferroelectric/insulator interfaces to create tunable ferroic orders for magnetoelectric device applications and provide opportunities for designing multiferroic materials in heterostructures.

Date: 2018
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DOI: 10.1038/s41467-018-02914-9

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