Intermolecular And Surface Forces

Materials research has driven the development of modern nano-electronic devices. In particular, research in magnetic thin films has revolutionized the development of spintronic devices1,2 because identifying new magnetic materials is key to better device performance and design. Van der Waals crystals retain their chemical stability and structural integrity down to the monolayer and, being atomically thin, are readily tuned by various kinds of gate modulation3,4. Recent experiments have demonstrated that it is possible to obtain two-dimensional ferromagnetic order in insulating Cr2Ge2Te6 (ref. 5) and CrI3 (ref. 6) at low temperatures. Here we develop a device fabrication technique and isolate monolayers from the layered metallic magnet Fe3GeTe2 to study magnetotransport. We find that the itinerant ferromagnetism persists in Fe3GeTe2 down to the monolayer with an out-of-plane magnetocrystalline anisotropy. The ferromagnetic transition temperature, Tc, is suppressed relative to the bulk Tc of 205 kelvin in pristine Fe3GeTe2 thin flakes. An ionic gate, however, raises Tc to room temperature, much higher than the bulk Tc. The gate-tunable room-temperature ferromagnetism in two-dimensional Fe3GeTe2 opens up opportunities for potential voltage-controlled magnetoelectronics7-11 based on atomically thin van der Waals crystals.

Gate-tunable Room-temperature Ferromagnetism in Two-dimensional Fe 3 GeTe 2

https://www.pnas.org/content/pnas/90/5/1635.full.pdf

Supramolecular chemistry.

Y.C. thanks Prof. Jean-Pierre Sauvage, Enrico Traversa, Jean-Marie Basset, Yi Zhang, Min Liu, Bo Tang, Yu-Bin Dong, Guo-Xia Jin, Tao Yue, Hai Xu for the helpful discussion.

/pdf/2d-crystalline-monolayer-nanosheets-produced-from-1d-31wrgmf0ev.pdf

2D Crystalline Monolayer Nanosheets Produced from 1D-Amorphous Metal-Organic Framework

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2D Crystalline Monolayer Nanosheets Produced from 1D-Amorphous Metal-Organic Framework