Journal Article magnetic topological insulators 2D materials CVD Dirac fermions Kagome‐lattice MOCVD MoS2 analog memory contact scaling current crowding current‐induced switching dual-gating electric fields hard ferromagnets intimate contacts low-energy memory metalorganic chemistry nanocomposites negative differential resistance neuro-inspired phase-change memory nodal line metals on‐chip synthesis quantum anomalous Hall effect quantum criticality semimetals spin fluctuations spin‐orbit torque topological materials topological phase transitions