Apparent Ferromagnetism in Exfoliated Ultrathin Pyrite Sheets
Apparent Ferromagnetism in Exfoliated Ultrathin Pyrite Sheets
There has been no experimental evidence for ferromagnetic ordering in isotropic atomically thin two-dimensional crystals, until a bilayer Cr2Ge2Te6 and a three-atom thick monolayer CrI3 is shown to retain ferromagnetic ordering at finite temperatures. Here, we demonstrate successful isolation of a non-van der Waals-type ultrathin nanosheet of FeS2 derived from …