Controllable CVD-Growth of 2D Cr5Te8 Nanosheets with Thickness-Dependent Magnetic Domains

TL;DR

This paper reports the controlled growth of 2D Cr5Te8 nanosheets via CVD, revealing thickness-dependent magnetic domains and providing insights into magnetic interactions, which advances the understanding and manipulation of 2D magnetic materials.

Contribution

It introduces a method for controllably synthesizing 2D Cr5Te8 nanosheets and uncovers their thickness-dependent magnetic domain behaviors for the first time.

Findings

Cr5Te8 nanosheets exhibit out-of-plane ferromagnetism with a Curie temperature of 179 K.

Magnetic domains are thickness-dependent, showing maze-like structures that change with thickness.

Dipolar interactions dominate over exchange and anisotropy in magnetic domain formation.

Abstract

As a typical 2D magnetic material with self-intercalated structure, Cr5Te8 exhibits many fascinating magnetic properties. Although the ferromagnetism of 2D Cr5Te8 has been reported, the study of its magnetic domain is still blank. Herein, we successfully fabricated 2D Cr5Te8 nanosheets with controlled thickness and lateral size by chemical vapor deposition (CVD). Then magnetic property measurement system suggested Cr5Te8 nanosheets possessing intense out-of-plane ferromagnetism with the Curie temperature of 179 K. Most importantly, we found magnetic bubbles and thickness-dependent maze-like magnetic domains by cryogenic magnetic force microscopy (MFM) for the first time. The domain width of the maze-like magnetic domains increases rapidly with decreasing sample thickness, while domain contrast decreases. This indicates dipolar interaction is the dominant role over exchange interaction and magnetic anisotropy. Our work not only paves a way for the controllable growth of 2D magnetic materials, but also suggests new directions for controlling magnetic phases and systematically adjusting domain properties.