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Nearly room temperature ferromagnetism in a magnetic metal-rich van der Waals metal.

  • Seo J Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang 37673, Korea.
  • Kim DY Center for High Pressure Science and Technology Advanced Research, Shanghai, China.
  • An ES Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang 37673, Korea.
  • Kim K Max Planck POSTECH/Hsinchu Center for Complex Phase Materials, Pohang University of Science and Technology, Pohang, Korea.
  • Kim GY Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 37673, Korea.
  • Hwang SY Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 37673, Korea.
  • Kim DW Department of Chemistry, Pohang University of Science and Technology, Pohang 37673, Korea.
  • Jang BG Department of Chemistry, Pohang University of Science and Technology, Pohang 37673, Korea.
  • Kim H Max Planck POSTECH/Hsinchu Center for Complex Phase Materials, Pohang University of Science and Technology, Pohang, Korea.
  • Eom G Department of Physics, Ajou University, Suwon 16499, Korea.
  • Seo SY Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang 37673, Korea.
  • Stania R Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang 37673, Korea.
  • Muntwiler M Paul Scherrer Institut, 5232 Villigen, Switzerland.
  • Lee J Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang 37673, Korea.
  • Watanabe K National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
  • Taniguchi T National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
  • Jo YJ Department of Physics, Kyungpook National University, Daegu 41566, Korea.
  • Lee J Department of Physics, Ajou University, Suwon 16499, Korea.
  • Min BI Department of Physics, Pohang University of Science and Technology, Pohang 37673, Korea.
  • Jo MH Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang 37673, Korea.
  • Yeom HW Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang 37673, Korea.
  • Choi SY Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 37673, Korea.
  • Shim JH Department of Chemistry, Pohang University of Science and Technology, Pohang 37673, Korea.
  • Kim JS Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang 37673, Korea.
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  • 2020-02-04
Published in:
  • Science advances. - 2020
English In spintronics, two-dimensional van der Waals crystals constitute a most promising material class for long-distance spin transport or effective spin manipulation at room temperature. To realize all-vdW-material-based spintronic devices, however, vdW materials with itinerant ferromagnetism at room temperature are needed for spin current generation and thereby serve as an effective spin source. We report theoretical design and experimental realization of a iron-based vdW material, Fe4GeTe2, showing a nearly room temperature ferromagnetic order, together with a large magnetization and high conductivity. These properties are well retained even in cleaved crystals down to seven layers, with notable improvement in perpendicular magnetic anisotropy. Our findings highlight Fe4GeTe2 and its nanometer-thick crystals as a promising candidate for spin source operation at nearly room temperature and hold promise to further increase T c in vdW ferromagnets by theory-guided material discovery.
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  • English
Open access status
gold
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https://folia.unifr.ch/global/documents/126914
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