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<p>Two-dimensional (2D) iron oxide has aroused particular interest for its important roles in exploring fundamental physics and emerging spintronics. As a unique 2D ferromagnetic material with a nonlayered structure, <i>γ</i>-Fe<sub>2</sub>O<sub>3</sub> exhibits many intriguing magnetic properties. However, since <i>γ</i>-Fe<sub>2</sub>O<sub>3</sub> is metastable and tends to transform into <i>α</i>-Fe<sub>2</sub>O<sub>3</sub>, producing high-quality pure <i>γ</i>-Fe<sub>2</sub>O<sub>3</sub> remains a challenge. Herein, we have successfully synthesized 2D <i>γ</i>-Fe<sub>2</sub>O<sub>3</sub> nanotriangles with pure phase and high Curie temperature <i>via</i> a substrate symmetry-induced strategy. Since the atoms in the top layer of the sapphire substrate generally have six-fold symmetry, <i>γ</i>-Fe<sub>2</sub>O<sub>3</sub> nanotriangles exhibit two orientations, including 0° and 60° antialigned domains. Furthermore, we observe a pronounced incidence of merged growth both among 0°–0° and 0°–60° nanotriangles. Magnetic force microscopy (MFM) reveals that the individual nanotriangle <i>γ</i>-Fe<sub>2</sub>O<sub>3</sub> exhibits the typical ferromagnetic vortex state, whereas the domain is prominently suppressed in merged nanotriangles. This work provides novel insights into 2D ferromagnetic materials, marking a pivotal step toward their practical deployment in high-performance spintronic and quantum devices.</p>

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Symmetry-induced Growth of Two-dimensional Ferromagnetic γ-Fe2O3

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Ruijie Zhang,
  • Lin Li,
  • Qing Zhang,
  • Yongshuai Wang,
  • Mengchen Wang,
  • Dechao Geng

摘要

Two-dimensional (2D) iron oxide has aroused particular interest for its important roles in exploring fundamental physics and emerging spintronics. As a unique 2D ferromagnetic material with a nonlayered structure, γ-Fe2O3 exhibits many intriguing magnetic properties. However, since γ-Fe2O3 is metastable and tends to transform into α-Fe2O3, producing high-quality pure γ-Fe2O3 remains a challenge. Herein, we have successfully synthesized 2D γ-Fe2O3 nanotriangles with pure phase and high Curie temperature via a substrate symmetry-induced strategy. Since the atoms in the top layer of the sapphire substrate generally have six-fold symmetry, γ-Fe2O3 nanotriangles exhibit two orientations, including 0° and 60° antialigned domains. Furthermore, we observe a pronounced incidence of merged growth both among 0°–0° and 0°–60° nanotriangles. Magnetic force microscopy (MFM) reveals that the individual nanotriangle γ-Fe2O3 exhibits the typical ferromagnetic vortex state, whereas the domain is prominently suppressed in merged nanotriangles. This work provides novel insights into 2D ferromagnetic materials, marking a pivotal step toward their practical deployment in high-performance spintronic and quantum devices.