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O: Fachverband Oberflächenphysik
O 64: Focus Session Atomic Scale Investigation of Magnetic 2D Materials
O 64.2: Hauptvortrag
Mittwoch, 19. März 2025, 15:30–16:00, H2
Ferromagnetic Order in 2D Layers of Transition Metal Dichlorides — Andrea Aguirre1, Andres Pinar2, Diego Soler2, Carmen Gonzalez-Orellana1, Jon Ortuzar3, Oleksandr Stesovych2, Celia Rogero1, Jose Ignacio Pascual3, Pavel Jelinek2, Maxim Ilyn1, and •Martina Corso1 — 1Centro de Fisica de Materiales, San Sebastian, Spain — 2Institute of Physics, Czech Academy of Sciences, Prague, Czech Republic — 3CIC NanoGUNE, San Sebastian, Spain
Transition metals dihalides are an ideal class of van der Waals materials that enable the study of magnetic phases as function of the transition metal and halide composition as predicted by theory. Here, we characterize the magnetic and electronic properties of 2D magnets based on metallic dichlorides. The materials form flat epitaxial layers on Au(111) with semiconducting character. By X-Ray Magnetic Circular Dichroism (XMCD) measurements we find that single layers of FeCl2 and NiCl2 are soft ferromagnets on Au(111) and their magnetization can be switched from out-of-plane to in-plane by substituting the metal ion from Fe to Ni. Using low temperature scanning tunnelling microscopy with tips functionalized with a nickelocene molecule as magnetic sensor, we confirm the magnetic order of the materials at the atomic scale even at zero applied magnetic field. We thus established a correlation between the mesoscopic magnetic properties probed by XMCD and the atomic spins. Our results suggest that these 2D semiconducting magnets could be implemented in van der Waals heterostructures for applications in spintronics and opto-spintronics.
Keywords: 2D material; ferromagnetism; transition metal halides; XMCD; STM