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O: Fachverband Oberflächenphysik
O 30: Surface Magnetism
O 30.6: Vortrag
Dienstag, 18. März 2025, 12:00–12:15, H11
Single-layer magnetism of epitaxial NiBr2 and FeBr2 on NbSe2 — •Sebastien E. Hadjadj1, Carmen Gonzalez-Orellana2, Adriana Candia3, Pierluigi Gargiani4, Matthias Muntwiler5, Jan Dreiser5, Jorge Lobo3, Celia Rogero2, and Maxim Ilyn2 — 1Materials Physics Center (MPC), Donostia, Spain — 2Centro de Fisica de Materiales (CSIC/UPV-EHU), Donostia-San Sebastian, Spain — 3Instituto de Nanociencia y Materiales de Aragon (INMA),Zaragoza, Spain — 4ALBA Synchrotron Light Source, Barcelona, Spain — 5Paul Scherrer Institut, Villigen, Switzerland
Two-dimensional metal dihalides exhibit promising magnetic and electronic properties. Over the past years, the research focus on novel 2D magnetic materials has shifted to transition metal di-halides (TMDH). Recent reports have shown that the first layer of Br-based TMDH grown on Au(111) behaves structurally and magnetically differently from the second layer [1-2]. Here we report the first layer growth of NiBr2 and FeBr2 on NbSe2, which shows no signs of decomposition as observed for NiBr2 on Au(111) and shows unaffected stable magnetic properties ranging from monolayer to multilayer. The structural characterization of the samples revealed a strong temperature dependence in the resulting island growth and appearence of the moiré pattern. XMCD measurements probed magnetic ordering down to the 2D limit, which is in agreement with the literature values. In the case of FeBr2 a strong reduction of the spin magnetic moment has been observed. [1] Djuro Bikaljevic et al., ACS Nano, 15, 14985, (2021) [2] S. E. Hadjadj et al., Chem. Mater., 35, 23, 9847-9856, (2023)
Keywords: 2D materials; 2D magnetism; TMDH; van der Waals heterostructure