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

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

Research output: Contribution to journalArticlepeer-review

213 Citations (Scopus)

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 Tc in vdW ferromagnets by theory-guided material discovery.

Original languageEnglish
Article numbereaay8912
JournalScience advances
Volume6
Issue number3
DOIs
Publication statusPublished - 17 Jan 2020

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