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Controlling the magnetic anisotropy in Cr₂Ge₂Te₆ by electrostatic gating

Verzhbitskiy, IA; Kurebayashi, H; Cheng, H; Zhou, J; Khan, S; Feng, YP; Eda, G; (2020) Controlling the magnetic anisotropy in Cr₂Ge₂Te₆ by electrostatic gating. Nature Electronics , 3 pp. 460-465. 10.1038/s41928-020-0427-7. Green open access

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Abstract

Electrical control of magnetism in van der Waals ferromagnetic semiconductors is an important step in creating novel spintronic devices, capable of processing and storing information, with these materials. For practical devices, electrical control at or near room temperature is sought, but most layered ferromagnetic semiconductors exhibit Curie temperatures below 100 K. Here, we show that electrostatic gating of thin chromium germanium telluride (Cr2Ge2Te6) crystals can be used to modulate the magnetic phase transition and magnetic anisotropy of this layered ferromagnetic semiconductor and increase its Curie temperature. Using an electric double-layer transistor device, we observe ferromagnetism in the material at temperatures up to 200 K and find that its magnetic easy axis is in the in-plane direction, in contrast to the out-of-plane easy axis of undoped Cr2Ge2Te6. Our analysis suggests that heavy doping promotes a double-exchange mechanism that is mediated by free carriers, which dominates over the superexchange mechanism of the original insulating state.

Type: Article
Title: Controlling the magnetic anisotropy in Cr₂Ge₂Te₆ by electrostatic gating
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/s41928-020-0427-7
Publisher version: https://doi.org/10.1038/s41928-020-0427-7
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Ferromagnetism, Information storage, Magnetic properties and materials, Two-dimensional materials
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/10103170
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