Gate-tunable room-temperature ferromagnetism in two-dimensional Fe3GeTe2

By Yujun Deng, Yijun Yu, Yicheng Song, Jingzhao Zhang, Naizhou Wang, Zeyuan Sun, Yangfan Yi, Yi Zheng Wu, Shiwei Wu, Junyi Zhu and 3 more. Nature, 2018

2,261 citations recorded by the source corpus.

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. Monolayers of Fe3GeTe2 exhibit itinerant ferromagnetism with an out-of-plane magnetocrystalline anisotropy; ionic gating raises the ferromagnetic transition temperature of few-layer Fe3GeTe2 to room temperature.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/a5dabeb4bfa530a3b9184ac575f8b1a7e667068f

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Atomic and Molecular Physics, and Optics

1. M. Ezawa
2. Hector Ochoa
3. I. Vera-Marun
4. Weisheng Zhao
5. Ahmet Avsar
6. J. V. Wees
7. Xichao Zhang
8. J. Coraux

In Materials Chemistry

1. Hector Ochoa
2. M. Ezawa
3. I. Vera-Marun
4. Xing Wu
5. J. Coraux
6. B. Özyilmaz
7. Francisco Guinea
8. N. M. R. Peres

Citations in the corpus

• Skyrmion-electronics: writing, deleting, reading and processing magnetic skyrmions toward spintronic applications (2019, background): “These studies on 2D magnets opened a whole new door toward 2D heterostructure-based spintronics, as a result, there appeared significant following interests and efforts revealing the possibility of such devices by demonstrating the magnetoresistance effect in 2D magnets [308], gate-tunable roomtempe”
• Room temperature ferromagnetism in ultra-thin van der Waals crystals of 1T-CrTe2 (2020, background): “Interestingly, even in some of those vdW magnets with relatively low intrinsic Curie temperature (TC) such as Fe3GeTe2, room temperature 2D ferromagnetism may be realized via certain extrinsic manners, such as strong electron doping with an ionic gate [5], or an enhancement of magnetic anisotropy en”
• Colloquium : Spintronics in graphene and other two-dimensional materials (2019, background): “…al., 2016), proximity induced spin-to-charge conversion in graphene/TMDC heterostructures (Ghiasi et al., 2019; Li et al., 2019; Safeer et al., 2019), and the recent discovery of 2D magnets which can even remain magnetically ordered down to a few atoms thick at room temperature (Deng et al., 2018).”
• Magnetism, symmetry and spin transport in van der Waals layered systems (2021, neutral): “Fe-Ge-Te compounds 16,30,92,98 , Fe 0.25 TaS 286 and Cr-X (X=Te,Se) compounds 76,99,100 .”