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Orthogonal interlayer coupling in an all-antiferromagnetic junction

Author

Listed:
  • Yongjian Zhou

    (Tsinghua University)

  • Liyang Liao

    (Tsinghua University)

  • Tingwen Guo

    (Tsinghua University)

  • Hua Bai

    (Tsinghua University)

  • Mingkun Zhao

    (University of Chinese Academy of Sciences, Chinese Academy of Sciences)

  • Caihua Wan

    (University of Chinese Academy of Sciences, Chinese Academy of Sciences)

  • Lin Huang

    (Tsinghua University)

  • Lei Han

    (Tsinghua University)

  • Leilei Qiao

    (Tsinghua University)

  • Yunfeng You

    (Tsinghua University)

  • Chong Chen

    (Tsinghua University)

  • Ruyi Chen

    (Tsinghua University)

  • Zhiyuan Zhou

    (Tsinghua University)

  • Xiufeng Han

    (University of Chinese Academy of Sciences, Chinese Academy of Sciences)

  • Feng Pan

    (Tsinghua University)

  • Cheng Song

    (Tsinghua University)

Abstract

In conventional ferromagnet/spacer/ferromagnet sandwiches, noncollinear couplings are commonly absent because of the low coupling energy and strong magnetization. For antiferromagnets (AFM), the small net moment can embody a low coupling energy as a sizable coupling field, however, such AFM sandwich structures have been scarcely explored. Here we demonstrate orthogonal interlayer coupling at room temperature in an all-antiferromagnetic junction Fe2O3/Cr2O3/Fe2O3, where the Néel vectors in the top and bottom Fe2O3 layers are strongly orthogonally coupled and the coupling strength is significantly affected by the thickness of the antiferromagnetic Cr2O3 spacer. From the energy and symmetry analysis, the direct coupling via uniform magnetic ordering in Cr2O3 spacer in our junction is excluded. The coupling is proposed to be mediated by the non-uniform domain wall state in the spacer. The strong long-range coupling in an antiferromagnetic junction provides an unexplored approach for designing antiferromagnetic structures and makes it a promising building block for antiferromagnetic devices.

Suggested Citation

  • Yongjian Zhou & Liyang Liao & Tingwen Guo & Hua Bai & Mingkun Zhao & Caihua Wan & Lin Huang & Lei Han & Leilei Qiao & Yunfeng You & Chong Chen & Ruyi Chen & Zhiyuan Zhou & Xiufeng Han & Feng Pan & Che, 2022. "Orthogonal interlayer coupling in an all-antiferromagnetic junction," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-31531-w
    DOI: 10.1038/s41467-022-31531-w
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