Unlocking the charge doping effect in softly intercalated ultrathin ferromagnetic superlattice
Liang Hu,
Bingzhang Yang,
Zhipeng Hou,
Yangfan Lu,
Weitao Su,
Lingwei Li
Affiliations
Liang Hu
Key Laboratory of Novel Materials for Sensor of Zhejiang Province, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, PR China; State Key Lab of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, PR China
Bingzhang Yang
Key Laboratory of Novel Materials for Sensor of Zhejiang Province, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, PR China
Zhipeng Hou
South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, PR China
Yangfan Lu
Key Laboratory of Novel Materials for Sensor of Zhejiang Province, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, PR China
Weitao Su
Key Laboratory of Novel Materials for Sensor of Zhejiang Province, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, PR China
Lingwei Li
Key Laboratory of Novel Materials for Sensor of Zhejiang Province, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, PR China; Corresponding author.
The electrolyte-assisted exfoliation strategy is widely employed to synthesize ultrathin two-dimensional (2D) materials. Yet, spins in 2D magnets are susceptible to the electrolyte due to the underlying charge doping effect. Hence, it is crucial to understand and trace the doping process during the delamination of 2D magnets. Taking the prototype Fe3GeTe2, we utilized soft organic cations to exfoliate the bulk and obtain a freestanding organic–inorganic hybrid superlattice with a giant electron doping effect as high as 6.9 × 1014/cm2 (∼1.15 electrons per formula unit). A remarkable ferromagnetic transition exceeding 385 K was revealed in these superlattices, together with unique anisotropic saturation magnetization. The doping enhanced the in-plane electron–phonon coupling and thus optimized originally poor indirect double-exchange scenario for spin electrons. The emerging vertical magnetization shift phenomenon served to evaluate the uniformity of charge doping. The above findings provide a new perspective for understanding the role of parasitic charge in 2D magnetism.
