Anomalous Thickness Dependence of Curie Temperature in Air-stable Two-dimensional Ferromagnetic 1T-CrTe Grown by Chemical Vapor Deposition

Overview

Journal Nat Commun

Specialty Biology

Date 2021 Feb 6

PMID 33547287

Citations 24

Authors

Lingjia Meng

Zhang Zhou

Mingquan Xu

Shiqi Yang

Kunpeng Si

Lixuan Liu

Xingguo Wang

Huaning Jiang

Bixuan Li

Peixin Qin

Peng Zhang

Jinliang Wang

Zhiqi Liu

Peizhe Tang

Yu Ye

Wu Zhou

Lihong Bao

Hong-Jun Gao

Yongji Gong

Affiliations

Soon will be listed here.

Abstract

The discovery of ferromagnetic two-dimensional van der Waals materials has opened up opportunities to explore intriguing physics and to develop innovative spintronic devices. However, controllable synthesis of these 2D ferromagnets and enhancing their stability under ambient conditions remain challenging. Here, we report chemical vapor deposition growth of air-stable 2D metallic 1T-CrTe ultrathin crystals with controlled thickness. Their long-range ferromagnetic ordering is confirmed by a robust anomalous Hall effect, which has seldom been observed in other layered 2D materials grown by chemical vapor deposition. With reducing the thickness of 1T-CrTe from tens of nanometers to several nanometers, the easy axis changes from in-plane to out-of-plane. Monotonic increase of Curie temperature with the thickness decreasing from ~130.0 to ~7.6 nm is observed. Theoretical calculations indicate that the weakening of the Coulomb screening in the two-dimensional limit plays a crucial role in the change of magnetic properties.

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