Exchange-biased nanocomposite ferromagnetic insulator

Ji Zhang, Jingtian Zhou, Zhen-Lin Luo, Y. B. Chen, Jian Zhou, Weiwei Lin, Ming-Hui Lu, Shan-Tao Zhang, Chen Gao, Di Wu, and Yan-Feng Chen
Phys. Rev. B 101, 014422 – Published 15 January 2020
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Abstract

Magnetic insulating and exchange bias (EB) are two basic magnetic states with actual and potential applications in spintronic and magnonic devices. However, ferromagnetic insulators (FMIs) are rare, and it is even more challenging to obtain a FMI with large EB. In this paper, high performance of FMIs and EB in LaMnO3:NiO nanocomposite epitaxial thin films is reported. The antiferromagnetic NiO nanoparticles, randomly embedded in a ferromagnetic LaMnO3 matrix, enhance the robustness of the insulating state and result in an EB field as large as 1100 Oe. The simultaneously enhanced resistivity and EB are attributed to localized oxygen vacancy, preserved strain state, and increased ferromagnetic-antiferromagnetic interface ratio. This paper provides not only a material candidate for spintronics but also a referential strategy to design artificial materials with multifunctionality.

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  • Received 27 September 2019
  • Revised 23 December 2019

DOI:https://doi.org/10.1103/PhysRevB.101.014422

©2020 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Ji Zhang1, Jingtian Zhou2, Zhen-Lin Luo2,*, Y. B. Chen3, Jian Zhou1, Weiwei Lin4, Ming-Hui Lu1, Shan-Tao Zhang1,†, Chen Gao5, Di Wu1, and Yan-Feng Chen1

  • 1National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, College of Engineering and Applied Science and Jiangsu Key Laboratory of Artificial Functional Materials and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  • 2National Synchrotron Radiation Laboratory and Chinese Academy of Sciences Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei, Anhui 230026, China
  • 3National Laboratory of Solid State Microstructures and School of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  • 4Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
  • 5Beijing Advanced Sciences and Innovation Center of Chinese Academy of Sciences, Beijing 101407, China

  • *Corresponding author: zlluo@ustc.edu.cn
  • Corresponding author: stzhang@nju.edu.cn

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Issue

Vol. 101, Iss. 1 — 1 January 2020

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