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

Abstract

Here, 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.

Authors:
ORCiD logo [1];  [2];  [3];  [3]; ORCiD logo [3];  [1];  [1];  [1];  [4];  [5]; ORCiD logo [6];  [3];  [7];  [8];  [6];  [5];  [4];  [3];  [3];  [9]
  1. Univ. of California, Irvine, CA (United States). Dept. of Chemical Engineering and Materials Science
  2. Nanjing Univ. (China). National Lab. of Solid State Microstructures and College of Engineering and Applied Sciences
  3. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
  4. National Chiao Tung Univ., HsinChu (Taiwan). Dept. of Materials Science and Engineering
  5. Arizona State Univ., Tempe, AZ (United States). Dept. of Physics
  6. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Physics
  7. Univ. of California, Irvine, CA (United States). Irvine Materials Research Inst.
  8. Xiangtan Univ., Xiangtan (China). School of Materials Science and Engineering
  9. Univ. of California, Irvine, CA (United States). Dept. of Chemical Engineering and Materials Science and Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1489407
Grant/Contract Number:  
SC0014430; SC0012670; FG02-05ER46237
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Zhang, Yi, Xie, Lin, Kim, Jeongwoo, Stern, Alex, Wang, Hui, Zhang, Kui, Yan, Xingxu, Li, Linze, Liu, Henry, Zhao, Gejian, Chi, Hang, Gadre, Chaitanya, Lin, Qiyin, Zhou, Yichun, Uher, Ctirad, Chen, Tingyong, Chu, Ying -Hao, Xia, Jing, Wu, Ruqian, and Pan, Xiaoqing. Discovery of a magnetic conductive interface in PbZr0.2Ti0.8O3 /SrTiO3 heterostructures. United States: N. p., 2018. Web. doi:10.1038/s41467-018-02914-9.
Zhang, Yi, Xie, Lin, Kim, Jeongwoo, Stern, Alex, Wang, Hui, Zhang, Kui, Yan, Xingxu, Li, Linze, Liu, Henry, Zhao, Gejian, Chi, Hang, Gadre, Chaitanya, Lin, Qiyin, Zhou, Yichun, Uher, Ctirad, Chen, Tingyong, Chu, Ying -Hao, Xia, Jing, Wu, Ruqian, & Pan, Xiaoqing. Discovery of a magnetic conductive interface in PbZr0.2Ti0.8O3 /SrTiO3 heterostructures. United States. doi:10.1038/s41467-018-02914-9.
Zhang, Yi, Xie, Lin, Kim, Jeongwoo, Stern, Alex, Wang, Hui, Zhang, Kui, Yan, Xingxu, Li, Linze, Liu, Henry, Zhao, Gejian, Chi, Hang, Gadre, Chaitanya, Lin, Qiyin, Zhou, Yichun, Uher, Ctirad, Chen, Tingyong, Chu, Ying -Hao, Xia, Jing, Wu, Ruqian, and Pan, Xiaoqing. Thu . "Discovery of a magnetic conductive interface in PbZr0.2Ti0.8O3 /SrTiO3 heterostructures". United States. doi:10.1038/s41467-018-02914-9. https://www.osti.gov/servlets/purl/1489407.
@article{osti_1489407,
title = {Discovery of a magnetic conductive interface in PbZr0.2Ti0.8O3 /SrTiO3 heterostructures},
author = {Zhang, Yi and Xie, Lin and Kim, Jeongwoo and Stern, Alex and Wang, Hui and Zhang, Kui and Yan, Xingxu and Li, Linze and Liu, Henry and Zhao, Gejian and Chi, Hang and Gadre, Chaitanya and Lin, Qiyin and Zhou, Yichun and Uher, Ctirad and Chen, Tingyong and Chu, Ying -Hao and Xia, Jing and Wu, Ruqian and Pan, Xiaoqing},
abstractNote = {Here, 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.},
doi = {10.1038/s41467-018-02914-9},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United States},
year = {2018},
month = {2}
}

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Figures / Tables:

Fig. 1 Fig. 1 : Structural characterization and in situ domain switching. a Schematics of the STO/PZT/DSO (left) and STO/PZT/SRO/DSO (right) heterostructures. b Low-magnification TEM image shows repeating 90° domain walls in the PZT layer in a STO (20 nm)/PZT (50 nm)/DSO sample. Scale bar, 20 nm. c Low-magnification TEM image ofmore » STO (5 nm)/PZT (50 nm)/SRO(20 nm)/DSO sample. The PZT layer is single-domain with SRO as the bottom electrode. Scale bar, 20 nm. d HAADF STEM image shows a subarea on the STO/PZT interface marked in the box number 1 in b). The 90° domain wall highlighted by the blue dashed lines. The green arrows indicate the polarization directions determined by the lead displacement vectors DPb. Capacitor like domain switching in STO/PZT/SRO/DSO structure by in situ TEM. Capacitor like domain switching in STO/PZT/SRO/DSO structure by in situ TEM. Scale bar, 2 nm. e Dark-field TEM image shows a single-domain structure (downward polarization) at the initial state. Scale bar, 50 nm. f Capacitor-like domain switching occurs when a 0→−6 V DC voltage is applied by tungsten tip. Scale bar, 50 nm. g The sketch of SP-2DEG induced at the interface of STO/PZT« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.