Significant enhancement of ferromagnetism above room temperature in epitaxial 2D van der Waals ferromagnet FeGeTe/BiTe heterostructures.

Two-dimensional (2D) van der Waals (vdW) ferromagnetic metals FeGeTe with = 3-5 have raised significant interest in the scientific community. FeGeTe shows prospects for spintronic applications since the Curie temperature has been reported near or higher than 300 K. In the present work, epitaxial FeGeTe (FGT) heterostructures were grown by Molecular Beam Epitaxy (MBE) on insulating crystalline substrates.