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

Cited 177 time in Web of Science Cited 186 time in Scopus
Authors

Seo, Junho; Kim, Duck Young; An, Eun Su; Kim, Kyoo; Kim, Gi-Yeop; Hwang, Soo-Yoon; Kim, Dong Wook; Jang, Bo Gyu; Kim, Heejung; Eom, Gyeongsik; Seo, Seung Young; Stania, Roland; Muntwiler, Matthias; Lee, Jinwon; Watanabe, Kenji; Taniguchi, Takashi; Jo, Youn Jung; Lee, Jieun; Min, Byung Il; Jo, Moon Ho; Yeom, Han Woong; Choi, Si-Young; Shim, Ji Hoon; Kim, Jun Sung

Issue Date
2020-01
Publisher
American Association for the Advancement of Science
Citation
Science advances, Vol.6 No.3, p. eaay8912
Abstract
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.
ISSN
2375-2548
URI
https://hdl.handle.net/10371/201869
DOI
https://doi.org/10.1126/sciadv.aay8912
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  • College of Natural Sciences
  • Department of Physics and Astronomy
Research Area Condensed Matter Physics, Nanoscale Physics and Photonics, 나노 물리와 나노 광자학, 응집 물질 물리

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