Dresden 2026 – scientific programme
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DS: Fachverband Dünne Schichten
DS 1: Organic Thin Films
DS 1.3: Talk
Monday, March 9, 2026, 10:00–10:15, REC/C213
Prediction of room-temperature two-dimensional pi-electron half-metallic ferrimagnet — •Jan Phillips1, João C. G. Henriques1,2, Antonio T. Costa1,3, and Joaquín Fernández-Rossier1,4 — 1International Iberian Nanotechnology Laboratory (INL), Av. Mestre José Veiga, 4715-330 Braga, Portugal — 2Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain — 3Universidade do Minho, R. da Universidade, 4710-057 Braga, Portugal — 4On permanent leave from Departamento de Física Aplicada, Universidad de Alicante, 03690 San Vicente del Raspeig, Spain
We propose a strategy to obtain conducting organic materials with fully spin-polarized Fermi surface, lying at a singular flat band, with antiferromagnetically coupled magnetic moments that reside in pi-orbitals of nanographenes. We consider a honeycomb crystal whose unit cell combines two molecules with S=1/2: an Aza-3-Triangulene, a molecule with orbital degeneracy, and a a 2-Triangulene. The analyzed system is half-metallic with a ferrimagnetic order, presenting a zero net total magnetic moment per unit cell. We combine density functional theory calculations with a Hubbard model Hamiltonian to compute the magnetic interactions, the bands, and the collective spin excitations. We obtain very large intermolecular exchange couplings, in the range of 50 meV, which ensures room temperature stability. This crystal being a half-metal with fully compensated magnetic moments combines two characteristics that would make it ideal for spintronics applications.
Keywords: Nanographene; Magnetism; Singular Flat Band; Anomolous Hall effect; 2D