Origin of High-Temperature Antiferromagnetic Order in a van der Waals Material
The study reveals that substituting Co into Fe4GeTe2 induces layer-selective ordering and enhanced electronic correlations of quasi-localized Co 3d-states, which drive an unusually high-temperature antiferromagnetic order at 250 K in the van der Waals material (Fe0.65Co0.35)4GeTe2, establishing it as a promising candidate for AFM spintronics.