Tunable high-temperature itinerant antiferromagnetism in a van der Waals magnet

Junho Seo, Eun Su An, Taesu Park, Soo-Yoon Hwang, Gi-Yeop Kim, Kyung Song, Woo-suk Noh, J. Y. Kim, Gyu Seung Choi, Minhyuk Choi, Eunseok Oh, Kenji Watanabe, Takashi Taniguchi, J. -H. Park, Youn Jung Jo, Han Woong Yeom, Si-Young Choi (), Ji Hoon Shim () and Jun Sung Kim ()
Additional contact information
Junho Seo: Institute for Basic Science (IBS)
Eun Su An: Institute for Basic Science (IBS)
Taesu Park: Pohang University of Science and Technology (POSTECH)
Soo-Yoon Hwang: Pohang University of Science and Technology (POSTECH)
Gi-Yeop Kim: Pohang University of Science and Technology (POSTECH)
Kyung Song: KIMS
Woo-suk Noh: Max Planck POSTECH/Korea Research Initiative
J. Y. Kim: Institute for Basic Science (IBS)
Gyu Seung Choi: Institute for Basic Science (IBS)
Minhyuk Choi: Institute for Basic Science (IBS)
Eunseok Oh: Institute for Basic Science (IBS)
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
J. -H. Park: Pohang University of Science and Technology (POSTECH)
Youn Jung Jo: Kyungpook National University
Han Woong Yeom: Institute for Basic Science (IBS)
Si-Young Choi: Pohang University of Science and Technology (POSTECH)
Ji Hoon Shim: Pohang University of Science and Technology (POSTECH)
Jun Sung Kim: Institute for Basic Science (IBS)

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Discovery of two dimensional (2D) magnets, showing intrinsic ferromagnetic (FM) or antiferromagnetic (AFM) orders, has accelerated development of novel 2D spintronics, in which all the key components are made of van der Waals (vdW) materials and their heterostructures. High-performing and energy-efficient spin functionalities have been proposed, often relying on current-driven manipulation and detection of the spin states. In this regard, metallic vdW magnets are expected to have several advantages over the widely-studied insulating counterparts, but have not been much explored due to the lack of suitable materials. Here, we report tunable itinerant ferro- and antiferromagnetism in Co-doped Fe4GeTe2 utilizing the vdW interlayer coupling, extremely sensitive to the material composition. This leads to high TN antiferromagnetism of TN ~ 226 K in a bulk and ~210 K in 8 nm-thick nanoflakes, together with tunable magnetic anisotropy. The resulting spin configurations and orientations are sensitively controlled by doping, magnetic field, and thickness, which are effectively read out by electrical conduction. These findings manifest strong merits of metallic vdW magnets as an active component of vdW spintronic applications.

Date: 2021
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DOI: 10.1038/s41467-021-23122-y

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