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<p>Altermagnets recently emerged as a new class of magnetic materials, arising from specific spin crystal symmetries. They exhibit a spin-polarized electronic band structure similar to ferromagnets, yet possess zero net magnetization, promising exotic properties. Here we study a layered triangular lattice altermagnet, cobalt-intercalated NbSe<sub>2</sub> using scanning tunneling microscopy and spectroscopy (STM/S). Spectroscopic-imaging STM and spin-polarized STM reveals emergent 2<i>a</i><sub>0</sub> tri-directional charge and spin density modulations on the selenium surface. Density functional theory simulations suggest these modulations reflect the underlying cobalt superstructure. We discover that an out-of-plane magnetic field tunes the modulation amplitudes and the electronic density-of-states in a manner dependent on the field direction and strength. This behavior is attributed to the field-induced tilting of cobalt spins, which can have profound implications on the electronic properties of the altermagnet. Our results provide atomic-scale insights to uncover a magnetic-field tunable altermagnetic band structure, highlight the importance of understanding spin canting in altermagnets.</p>

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Discovery of magnetic-field-tunable density modulations and spin tilting in a layered altermagnet

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月31日

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  • Christopher Candelora,
  • Muxian Xu,
  • Siyu Cheng,
  • Alessandro De Vita,
  • Davide Romanin,
  • Chiara Bigi,
  • My Bang Petersen,
  • Alexander LaFleur,
  • Wilber Alfaro Castro,
  • Federico Motti,
  • Pasquale Orgiani,
  • Giovanni Vinai,
  • Matteo Calandra,
  • Jill Miwa,
  • Younghun Hwang,
  • Ziqiang Wang,
  • Federico Mazzola,
  • Ilija Zeljkovic

摘要

Altermagnets recently emerged as a new class of magnetic materials, arising from specific spin crystal symmetries. They exhibit a spin-polarized electronic band structure similar to ferromagnets, yet possess zero net magnetization, promising exotic properties. Here we study a layered triangular lattice altermagnet, cobalt-intercalated NbSe2 using scanning tunneling microscopy and spectroscopy (STM/S). Spectroscopic-imaging STM and spin-polarized STM reveals emergent 2a0 tri-directional charge and spin density modulations on the selenium surface. Density functional theory simulations suggest these modulations reflect the underlying cobalt superstructure. We discover that an out-of-plane magnetic field tunes the modulation amplitudes and the electronic density-of-states in a manner dependent on the field direction and strength. This behavior is attributed to the field-induced tilting of cobalt spins, which can have profound implications on the electronic properties of the altermagnet. Our results provide atomic-scale insights to uncover a magnetic-field tunable altermagnetic band structure, highlight the importance of understanding spin canting in altermagnets.