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<p>The electronic flat band in kagome lattice, arising from strong localization of electrons, provides an ideal platform to materialize both electron-correlated and topological phenomena. However, kagome metals with flat bands have been rarely explored in terms of utilizing its distinct characteristics for device functionality. Here, we report on the room-temperature ferrimagnet Co<sub>3</sub>Mo films with a Co-kagome lattice as potential magnetic devices. By applying band structure calculations and angle-resolved photoemission spectroscopy&#xa0;(ARPES), we discovered that the Co-kagome flat bands are located close to Fermi energy and magnetocrystalline anisotropy via spin-orbit interaction plays a key role for perpendicular magnetic anisotropy (PMA), resulting in characteristic small magnetization, large coercive field, and anomalous Hall effect. Furthermore, Pt-substitution in Co<sub>3</sub>Mo<sub>1-<i>x</i></sub>Pt<sub><i>x</i></sub> films dramatically enhances the PMA, highlighting the unique spin-orbit physics of the Co-kagome lattice. These findings establish Co<sub>3</sub>Mo as a promising platform for demonstration of magnetic devices based on topological concepts and for advancing flat-band physics.</p>

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Room-temperature perpendicular-anisotropic ferrimagnet Co3Mo mediated by cobalt-kagome flat band

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月16日

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  • K. Ishida,
  • K. Fujiwara,
  • K. Nakazawa,
  • T. Yamazaki,
  • S. Souma,
  • T. Seki,
  • D. Shiga,
  • H. Kumigashira,
  • T. Sato,
  • Y. Motome,
  • A. Tsukazaki

摘要

The electronic flat band in kagome lattice, arising from strong localization of electrons, provides an ideal platform to materialize both electron-correlated and topological phenomena. However, kagome metals with flat bands have been rarely explored in terms of utilizing its distinct characteristics for device functionality. Here, we report on the room-temperature ferrimagnet Co3Mo films with a Co-kagome lattice as potential magnetic devices. By applying band structure calculations and angle-resolved photoemission spectroscopy (ARPES), we discovered that the Co-kagome flat bands are located close to Fermi energy and magnetocrystalline anisotropy via spin-orbit interaction plays a key role for perpendicular magnetic anisotropy (PMA), resulting in characteristic small magnetization, large coercive field, and anomalous Hall effect. Furthermore, Pt-substitution in Co3Mo1-xPtx films dramatically enhances the PMA, highlighting the unique spin-orbit physics of the Co-kagome lattice. These findings establish Co3Mo as a promising platform for demonstration of magnetic devices based on topological concepts and for advancing flat-band physics.