Intrinsic Conductance of Domain Walls in BiFeO 3

Zhang, Yi; Lu, Haidong; Yan, Xingxu; Cheng, Xiaoxing; Xie, Lin; Aoki, Toshihiro; Li, Linze; Heikes, Colin; Lau, Shu Ping; Schlom, Darrell G.; Chen, Longqing; Gruverman, Alexei; Pan, Xiaoqing

doi:10.1002/adma.201902099

Intrinsic Conductance of Domain Walls in BiFeO ₃

Journal Article · Sun Jul 28 00:00:00 EDT 2019 · Advanced Materials

DOI:https://doi.org/10.1002/adma.201902099· OSTI ID:1545391

^[1]; Lu, Haidong ^[2]; Yan, Xingxu ^[1]; Cheng, Xiaoxing ^[3]; Xie, Lin ^[1]; Aoki, Toshihiro ^[4]; Li, Linze ^[1]; Heikes, Colin ^[5]; Lau, Shu Ping ^[6]; Schlom, Darrell G. ^[7]; Chen, Longqing ^[3]; Gruverman, Alexei ^[2]; Pan, Xiaoqing ^[8]

Department of Materials Science and Engineering University of California Irvine Irvine CA 92697 USA
Department of Physics and Astronomy &, Nebraska Center for Materials and Nanoscience University of Nebraska Lincoln NE 68588 USA
Department of Materials Science and Engineering Pennsylvania State University State College PA 16802 USA
Irvine Materials Research Institute University of California Irvine CA 92697 USA
Department of Materials Science and Engineering Cornell University Ithaca NY 14850 USA
Department of Applied Physics The Hong Kong Polytechnic University Hung Hom Kowloon 999077 Hong Kong
Department of Materials Science and Engineering Cornell University Ithaca NY 14850 USA, Kavli Institute at Cornell for Nanoscale Science Ithaca NY 14853 USA
Department of Materials Science and Engineering University of California Irvine Irvine CA 92697 USA, Department of Physics and Astronomy University of California Irvine CA 92697 USA

Abstract

Ferroelectric domain walls exhibit a number of new functionalities that are not present in their host material. One of these functional characteristics is electrical conductivity that may lead to future device applications. Although progress has been made, the intrinsic conductivity of BiFeO ₃ domain walls is still elusive. Here, the intrinsic conductivity of 71° and 109° domain walls is reported by probing the local conductance over a cross section of the BiFeO ₃ /TbScO ₃ (001) heterostructure. Through a combination of conductive atomic force microscopy, high‐resolution electron energy loss spectroscopy, and phase‐field simulations, it is found that the 71° domain wall has an inherently charged nature, while the 109° domain wall is close to neutral. Hence, the intrinsic conductivity of the 71° domain walls is an order of magnitude larger than that of the 109° domain walls associated with bound‐charge‐induced bandgap lowering. Furthermore, the interaction of adjacent 71° domain walls and domain wall curvature leads to a variation of the charge distribution inside the walls, and causes a discontinuity of potential in the [110] _p direction, which results in an alternative conductivity of the neighboring 71° domain walls, and a low conductivity of the 71° domain walls when measurement is taken from the film top surface.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-07ER46417; SC0014430

OSTI ID:: 1545391

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 36 Vol. 31; ISSN 0935-9648

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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