中国物理B ›› 2021, Vol. 30 ›› Issue (9): 97504-097504.doi: 10.1088/1674-1056/ac1338

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Gate-controlled magnetic transitions in Fe3GeTe2 with lithium ion conducting glass substrate

Guangyi Chen(陈光毅)1, Yu Zhang(张玉)2, Shaomian Qi(齐少勉)1, and Jian-Hao Chen(陈剑豪)1,2,3,4,†   

  1. 1 International Center of Quantum Material, School of Physics, Peking University, Beijing 100871, China;
    2 Beijing Academy of Quantum Information Sciences, Beijing 100193, China;
    3 Key Laboratory for the Physics and Chemistry of Nanodevices, Peking University, Beijing 100871, China;
    4 Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials, Peking University, Beijing 100871, China
  • 收稿日期:2021-06-29 修回日期:2021-07-03 接受日期:2021-07-12 出版日期:2021-08-19 发布日期:2021-09-02
  • 通讯作者: Jian-Hao Chen E-mail:chenjianhao@pku.edu.cn
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant Nos. 2019YFA0308402 and 2018YFA0305604), the National Natural Science Foundation of China (Grant Nos. 11934001, 11774010, and 11921005), and Beijing Municipal Natural Science Foundation, China (Grant No. JQ20002).

Gate-controlled magnetic transitions in Fe3GeTe2 with lithium ion conducting glass substrate

Guangyi Chen(陈光毅)1, Yu Zhang(张玉)2, Shaomian Qi(齐少勉)1, and Jian-Hao Chen(陈剑豪)1,2,3,4,†   

  1. 1 International Center of Quantum Material, School of Physics, Peking University, Beijing 100871, China;
    2 Beijing Academy of Quantum Information Sciences, Beijing 100193, China;
    3 Key Laboratory for the Physics and Chemistry of Nanodevices, Peking University, Beijing 100871, China;
    4 Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials, Peking University, Beijing 100871, China
  • Received:2021-06-29 Revised:2021-07-03 Accepted:2021-07-12 Online:2021-08-19 Published:2021-09-02
  • Contact: Jian-Hao Chen E-mail:chenjianhao@pku.edu.cn
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant Nos. 2019YFA0308402 and 2018YFA0305604), the National Natural Science Foundation of China (Grant Nos. 11934001, 11774010, and 11921005), and Beijing Municipal Natural Science Foundation, China (Grant No. JQ20002).

摘要: Since the discovery of magnetism in two dimensions, effective manipulation of magnetism in van der Waals magnets has always been a crucial goal. Ionic gating is a promising method for such manipulation, yet devices gated with conventional ionic liquid may have some restrictions in applications due to the liquid nature of the gate dielectric. Lithium-ion conducting glass-ceramics (LICGC), a solid Li+ electrolyte, could be used as a substrate while simultaneously acts as a promising substitute for ionic liquid. Here we demonstrate that the ferromagnetism of Fe3GeTe2 (FGT) could be modulated via LICGC. By applying a voltage between FGT and the back side of LICGC substrate, Li+ doping occurs and causes the decrease of the coercive field (Hc) and ferromagnetic transition temperature (Tc) in FGT nanoflakes. A modulation efficiency for Hc of up to ~ 24.6% under Vg = 3.5 V at T =100 K is achieved. Our results provide another method to construct electrically-controlled magnetoelectronics, with potential applications in future information technology.

关键词: two-dimensional magnetism, two-dimensional material, ionic gating

Abstract: Since the discovery of magnetism in two dimensions, effective manipulation of magnetism in van der Waals magnets has always been a crucial goal. Ionic gating is a promising method for such manipulation, yet devices gated with conventional ionic liquid may have some restrictions in applications due to the liquid nature of the gate dielectric. Lithium-ion conducting glass-ceramics (LICGC), a solid Li+ electrolyte, could be used as a substrate while simultaneously acts as a promising substitute for ionic liquid. Here we demonstrate that the ferromagnetism of Fe3GeTe2 (FGT) could be modulated via LICGC. By applying a voltage between FGT and the back side of LICGC substrate, Li+ doping occurs and causes the decrease of the coercive field (Hc) and ferromagnetic transition temperature (Tc) in FGT nanoflakes. A modulation efficiency for Hc of up to ~ 24.6% under Vg = 3.5 V at T =100 K is achieved. Our results provide another method to construct electrically-controlled magnetoelectronics, with potential applications in future information technology.

Key words: two-dimensional magnetism, two-dimensional material, ionic gating

中图分类号:  (Magnetic properties of thin films, surfaces, and interfaces)

  • 75.70.-i
85.70.-w (Magnetic devices) 73.63.-b (Electronic transport in nanoscale materials and structures)