Two-dimensional magneto-photoconductivity in non-van der Waals manganese selenide

光电导性 材料科学 范德瓦尔斯力 凝聚态物理 光电子学 物理 冶金 量子力学 分子
作者
Liang Hu,Lei Cao,Lingwei Li,Juanmei Duan,Xiaoqi Liao,Fangchao Long,Jian Zhou,Yinguo Xiao,Y. J. Zeng,Shengqiang Zhou
出处
期刊:Materials horizons [Royal Society of Chemistry]
卷期号:8 (4): 1286-1296 被引量:57
标识
DOI:10.1039/d1mh00009h
摘要

Deficient intrinsic species and suppressed Curie temperatures (Tc) in two-dimensional (2D) magnets are major barriers for future spintronic applications. As an alternative, delaminating non-van der Waals (vdW) magnets can offset these shortcomings and involve robust bandgaps to explore 2D magneto-photoconductivity at ambient temperature. Herein, non-vdW α-MnSe2 is first delaminated as quasi-2D nanosheets for the study of emerging semiconductor, ferromagnetism and magneto-photoconductivity behaviors. Abundant nonstoichiometric surfaces induce the renormalization of the band structure and open a bandgap of 1.2 eV. The structural optimization strengthens ferromagnetic super-exchange interactions between the nearest-neighbor Mn2+, which enables us to achieve a high Tc of 320 K well above room temperature. The critical fitting of magnetization and transport measurements both verify that it is of quasi-2D nature. The above observations are evidenced by multiple microscopic and macroscopic characterization tools, in line with the prediction of first-principles calculations. Profiting from the negative magnetoresistance effect, the self-powered infrared magneto-photoconductivity performance including a responsivity of 330.4 mA W-1 and a millisecond-level response speed are further demonstrated. Such merits stem from the synergistic modulation of magnetic and light fields on photogenerated carriers. This provides a new strategy to manipulate both charge and spin in 2D non-vdW systems and displays their alluring prospects in magneto-photodetection.
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