Ferromagnetic Interlayer Exchange Coupling in Magnetic Topological Insulator Sandwich Heterostructures. - Hossain, Enayet; Causer, Grace L.; Li, Qile; Rubanov, Sergey; Xing, Kaijian; Blyth, James; Bhuiyan, Mohammad T. H.; Zhao, Mengting; Gebert, Matthew; Fuhrer, Michael S.; Edmonds, Mark T. (Advanced Science, 2026)