Growth of 2D Cr<sub>2</sub>O<sub>3</sub>–CrN Mosaic Heterostructures with Tunable Room‐Temperature Ferromagnetism
Liqiong He, Huiyu Nong, Junyang Tan, Qinke Wu, Rongxu Zheng, Shilong Zhao, Qiangmin Yu, Jingwei Wang, Bilu Liu
Abstract
Abstract 2D magnets have generated much attention due to their potential for spintronic devices. Heterostructures of 2D magnets are interesting platforms for exploring physical phenomena and applications. However, the controlled growth of 2D room‐temperature ferromagnetic heterostructures is challenging. Here, one‐pot chemical vapor deposition growth of stable 2D Cr 2 O 3 –CrN mosaic heterostructures (MHs) is reported with a controlled ratio of components that possess robust room‐temperature ferromagnetism. The 2D MHs consist of Cr 2 O 3 flakes with embedded CrN subdomains and the CrN:Cr 2 O 3 ratio can be tuned from 0% to 100% during growth. By changing the CrN:Cr 2 O 3 ratio, the ferromagnetism of the MHs (e.g., saturation magnetization, coercive field), which originates from the interfacial coupling between Cr 2 O 3 and CrN, can be controlled. Importantly, the obtained Cr 2 O 3 –CrN MHs are stable in air at elevated temperatures and have robust ferromagnetism with Curie temperature >400 K. This work presents a facile method for fabricating 2D MHs with tunable magnetism which will benefit high‐temperature spintronics.