Although many emerging new phenomena have been unraveled in two dimensional (2D) materials with long-range spin orderings, the usually low critical temperature in van der Waals (vdW) magnetic material has thus far hindered the related practical applications. Here, we show that ferromagnetism can hold above 300 K in a metallic phase of 1T-CrTe₂ down to the ultra-thin limit. It thus makes CrTe₂ so far the only known exfoliated ultra-thin vdW magnets with intrinsic long-range magnetic ordering above room temperature. An in-plane room-temperature negative anisotropic magnetoresistance (AMR) was obtained in ultra-thin CrTe₂ devices, with a sign change in the AMR at lower temperature, with -0.6% and +5% at 300 and 10 K, respectively. Our findings provide insights into magnetism in ultra-thin CrTe₂, expanding the vdW crystals toolbox for future room-temperature spintronic applications.

Magneto-luminescent molecules have significant applications in data storage and quantum computing. However, design of these bi-functional molecules coupled with magnetic behavior and photoluminescence is still challenging. In this work, we report a metallofullerene DyErScN@Ⅰ_h-C₈₀ exhibiting single-molecule magnet (SMM) behavior and near-infrared emission. For DyErScN@Ⅰ_h-C₈₀, two functional lanthanide metal ions of Dy³⁺ (SMM function) and Er³⁺ (luminescent function) are integrated inside a fullerene cage using a trimetallic nitride template, and its structure has been unambiguously characterized by single-crystal X-ray diffraction. Magnetic measurements revealed that DyErScN@Ⅰ_h-C₈₀ behaves as a SMM with a blocking temperature up to 9 K resulting from the intramolecular magnetic interaction between Dy³⁺ and Er³⁺ ions. Moreover, DyErScN@Ⅰ_h-C₈₀ exhibits temperature-dependent near-infrared emission around 1.5 µm with multiple splitting peaks from Er³⁺, which arises from the influence of Dy³⁺ ion. This study provides a new strategy to synthesize new magneto-luminescent molecule materials.