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

Author:

Seo Junho,An Eun Su,Park Taesu,Hwang Soo-YoonORCID,Kim Gi-Yeop,Song KyungORCID,Noh Woo-suk,Kim J. Y.,Choi Gyu Seung,Choi Minhyuk,Oh Eunseok,Watanabe KenjiORCID,Taniguchi TakashiORCID,Park J. -H.ORCID,Jo Youn Jung,Yeom Han WoongORCID,Choi Si-YoungORCID,Shim Ji HoonORCID,Kim Jun Sung

Abstract

AbstractDiscovery 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.

Funder

National Research Foundation of Korea

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry

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