Ferromagnetism above Room Temperature in Two Intrinsic van der Waals Magnets with Large Coercivity.

The emergence of two-dimensional (2D) van der Waals (vdW) magnets provides a broad platform for studying the magnetic properties of low-dimensional materials in condensed matter physics. However, the intrinsic ferromagnetism of 2D materials is mostly observed below room temperature, and most of them are soft ferromagnetic materials. Here, we report two intrinsic ferromagnetic vdW materials with Curie temperatures ( T C ) above room temperature, MnSiTe 3 ( T C ∼ 378 K) and MnGeTe 3 ( T C ∼ 349 K). Moreover, MnSiTe 3 exhibits a large coercivity ( H C ) at room temperature with an unprecedented H C of 1450 Oe, which is an increase of nearly 500% compared to the reported room-temperature vdW ferromagnets. The discovery of these two materials fills the gap of vdW room-temperature hard ferromagnets, providing a broad platform and possibilities for future research on low-dimensional spin electronic device applications.