Fig. 1: Magnetoelectric multiferroics and Cu+ ion polarizations in a ferromagnetic vdW cage.
From: Ferrielectricity controlled widely-tunable magnetoelectric coupling in van der Waals multiferroics
a Top and side views of the lattice structure of a CCPS monolayer. Interconnected CrS6 and P2S6 octahedrons form hexagonal vdW cages for polarizable Cu+ ions. b Schematic of the interlayer AFM order in CCPS, where only the Cr atomic layers are shown for clarity. c NCAFM imaging and line profiling of bilayer CCPS flakes on SiO2/Si substrates. d ADF-STEM image of a BL CCPS, showing high crystal quality without noticeable defects. e Top: device structure of thin-layer CCPS MTJs. Bottom: false-color optical image of a representative BL MTJ BL-S44. f Tunneling conductance G vs T curves of representative BL-S44 and 7L-S21. Inset: the corresponding dG/dT, revealing a thickness-independent AFM phase transition at about 30 K.
