Hard magnetic properties in nanoflake van der Waals Fe3GeTe2

Cheng Tan, Jinhwan Lee, Soon-Gil Jung, Tuson Park, Sultan Albarakati, James Partridge, Matthew R. Field, Dougal G. McCulloch, Lan Wang () and Changgu Lee ()
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Cheng Tan: RMIT University
Jinhwan Lee: Sungkyunkwan University
Soon-Gil Jung: Sungkyunkwan University
Tuson Park: Sungkyunkwan University
Sultan Albarakati: RMIT University
James Partridge: RMIT University
Matthew R. Field: RMIT University
Dougal G. McCulloch: RMIT University
Lan Wang: RMIT University
Changgu Lee: Sungkyunkwan University

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract Two-dimensional van der Waals materials have demonstrated fascinating optical and electrical characteristics. However, reports on magnetic properties and spintronic applications of van der Waals materials are scarce by comparison. Here, we report anomalous Hall effect measurements on single crystalline metallic Fe3GeTe2 nanoflakes with different thicknesses. These nanoflakes exhibit a single hard magnetic phase with a near square-shaped magnetic loop, large coercivity (up to 550 mT at 2 K), a Curie temperature near 200 K and strong perpendicular magnetic anisotropy. Using criticality analysis, the coupling length between van der Waals atomic layers in Fe3GeTe2 is estimated to be ~5 van der Waals layers. Furthermore, the hard magnetic behaviour of Fe3GeTe2 can be well described by a proposed model. The magnetic properties of Fe3GeTe2 highlight its potential for integration into van der Waals magnetic heterostructures, paving the way for spintronic research and applications based on these devices.

Date: 2018
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DOI: 10.1038/s41467-018-04018-w

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