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<p>Materials with room-temperature magnetic ordering and switchable polarization are essential for spintronic devices. Although 3 <i>d</i> transition metal oxides exhibit potential, their Curie temperature (<i>T</i><sub>C</sub>) remains unsatisfactory, and coexistence of magnetic and polar order has not been realized in 4 <i>d</i>/5 <i>d</i> oxides. Here, through epitaxial strain and 3<i>d</i>−4<i>d</i> cation ordering engineering, a ferrimagnetic insulating state (<i>T</i><sub>C</sub> ~ 623 K) is achieved in La<sub>2</sub>CoRuO<sub>6</sub> films, coexisting with switchable short-range polar nanodomains. Atomic-scale investigations and density functional theory calculations reveal that compressive strain enhances lattice distortions. These distortions, combined with high-spin state of Co<sup>2+</sup> ions and ordered B-site cations, significantly enhance Co-O-Ru antiferromagnetic superexchange, inducing the ferrimagnetic insulating state. Concurrently, the gradient BO<sub>6</sub> octahedral rotations with inhomogeneous evolution trigger B-site ions’ displacements, driving the formation of polar nanodomains. Our work fills the experimental gap in realizing magnetic and polar order coexistence in 4 <i>d</i>/5 <i>d</i> oxides and opens new avenues for designing high-<i>T</i><sub>C</sub> multiferroics.</p>

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Room-temperature ferrimagnetism and polar phase in strained La2CoRuO6 films through 3d-4d cation engineering

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月13日

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  • Dong Li,
  • Ying Zhou,
  • Kai Jiang,
  • Tiesheng Wang,
  • Chao Yun,
  • Yongli Yu,
  • Xuegang Chen,
  • Sixu Wang,
  • Shiqing Deng,
  • Yajing Liu,
  • Dazhi Wang,
  • Rui Wu,
  • Yuhao Qiu,
  • Shenghao Cai,
  • Erwen Zhang,
  • Maosheng Liu,
  • Xiaozhi Zhan,
  • Linglong Li,
  • Qian Li,
  • Tao Zhu,
  • Kelvin H. L. Zhang,
  • Shuai Dong,
  • Weiwei Li

摘要

Materials with room-temperature magnetic ordering and switchable polarization are essential for spintronic devices. Although 3 d transition metal oxides exhibit potential, their Curie temperature (TC) remains unsatisfactory, and coexistence of magnetic and polar order has not been realized in 4 d/5 d oxides. Here, through epitaxial strain and 3d−4d cation ordering engineering, a ferrimagnetic insulating state (TC ~ 623 K) is achieved in La2CoRuO6 films, coexisting with switchable short-range polar nanodomains. Atomic-scale investigations and density functional theory calculations reveal that compressive strain enhances lattice distortions. These distortions, combined with high-spin state of Co2+ ions and ordered B-site cations, significantly enhance Co-O-Ru antiferromagnetic superexchange, inducing the ferrimagnetic insulating state. Concurrently, the gradient BO6 octahedral rotations with inhomogeneous evolution trigger B-site ions’ displacements, driving the formation of polar nanodomains. Our work fills the experimental gap in realizing magnetic and polar order coexistence in 4 d/5 d oxides and opens new avenues for designing high-TC multiferroics.