Figure 3.

Routes toward room-temperature FM ordering in 2D layered materials by (a) electrostatic gating, (b) tuning dimensionality, and (c) proximity effect. Representative experimental examples include: (a) ionic liquid gating in Cr₂Ge₂Te₆, achieving a dramatic increase from 60K to 180 K in the ordering temperature. Adapted with permission from ref (86). Copyright 2020 Springer Nature. (b) Substantial T_c enhancement in Cr₂Te₃ flakes as the thickness is reduced, measured by anomalous Hall effect. Adapted with permission from ref (80). Copyright 2020 American Chemical Society. (c) Persistent magnetic signals up to 380 K in 4 nm-thick Fe₃GeTe₂ interfaced with the topological insulator Bi₂Te₃. Adapted with permission from ref (90). Copyright 2020 American Chemical Society.