Fig. 2. FM 2D [Gd₂C]²⁺·2e⁻ electride.

a, b Temperature (T) dependences of electrical resistivity (ρ) (a) and magnetization (M) (b) for single-crystal [Gd₂C]²⁺·2e⁻ electride and Gd metal under a magnetic field of 0.1 T. c Magnetic field (H) dependence of M for single-crystal [Gd₂C]²⁺·2e⁻ electride and Gd metal at 2 K. Each arrow indicates the saturation field of M. d H dependence of magnetoresistance under different directions of H. e XMCD spectra for Gd and C (inset) of single-crystal [Gd₂C]²⁺·2e⁻ electride compared with Gd metal and graphite (dotted curves). f Schematic illustration of the proposed FM/NM layered magnetic structure.