# Two-dimensional magnetic semiconductors with room Curie temperatures

## TL;DR

This paper introduces new 2D ferromagnetic semiconductors with high Curie temperatures, large magnetocrystalline anisotropy, and significant magneto-optical effects, promising for spintronic applications.

## Contribution

It reports the discovery and analysis of Tc-based 2D magnetic semiconductors with high Curie temperatures and large magnetic anisotropy, highlighting their potential for spintronics.

## Key findings

- High Curie temperatures around 200-500 K in TcSiTe3, TcGeSe3, TcGeTe3
- Large magnetocrystalline anisotropy energy and anomalous Hall conductivity
- Significant Kerr rotation angles in these 2D materials

## Abstract

We propose two-dimensional (2D) Ising-type ferromagnetic semiconductors TcSiTe3, TcGeSe3, and TcGeTe3 with high Curie temperatures around 200-0500 K. Owing to large spin-orbit couplings, the large magnetocrystalline anisotropy energy (MAE), large anomalous Hall conductivity, and large magneto-optical Kerr effect were discovered in these intriguing 2D materials. By comparing all possible 2D MGeTe3 materials (M = 3d, 4d, 5d transition metals), we found a large orbital moment around 0.5 $\mu$B per atom and a large MAE for TcGeTe3. The large orbital moments are revealed to be from the comparable crystal fields and electron correlations in these Tc-based 2D materials. The microscopic mechanism of the high Curie temperature is also addressed. Our findings reveal the unique magnetic behaviors of 2D Tc-based materials and present a family of 2D ferromagnetic semiconductors with large MAE and Kerr rotation angles that would have wide applications in designing spintronic devices.