Epitaxial growth of large-grain-size ferromagnetic monolayer CrI$_{3}$ for valley Zeeman splitting enhancement.

Lipeng Gong, Cheng Zhang, Anmin Nie, Changqing Lin, Hao Zhang, Chaofeng Gao, Meng Wang, Xi Zhang, Nannan Han, Huimin Su, Chen Lin, Yizheng Jin, Chenhui Zhang, Xixiang Zhang, Jun-Feng Dai, Yingchun Cheng, Wei Huang

Research output: Contribution to journalArticlepeer-review

Abstract

Two-dimensional (2D) magnetic CrI3 has received considerable research attention because of its intrinsic features, including insulation, Ising ferromagnetism, and stacking-order-dependent magnetism, as well as potential in spintronic applications. However, the current strategy for the production of ambient-unstable CrI3 thin layer is limited to mechanical exfoliation, which normally suffers from uncontrollable layer thickness, small size, and low yet unpredictable yield. Here, via a confined vapor epitaxy (CVE) method, we demonstrate the mass production of flower-like CrI3 monolayers on mica. Interestingly, we discovered the crucial role of K ions on the mica surface in determining the morphology of monolayer CrI3, reacting with precursors to form a KIx buffer layer. Meanwhile, the transport agent affects the thickness and size of the as-grown CrI3. Moreover, the Curie temperature of CrI3 is greatly affected by the interaction between CrI3 and the substrate. The monolayer CrI3 on mica could act as a magnetic substrate for valley Zeeman splitting enhancement of WSe2. We reckon our work represents a major advancement in the mass production of monolayer 2D CrI3 and anticipate that our growth strategy may be extended to other transition metal halides.
Original languageEnglish (US)
JournalNanoscale
DOIs
StatePublished - Jan 28 2021

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