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DS: Fachverband Dünne Schichten

DS 9: Focus Session: 2D Transition Metal Carbides, Nitrides and Carbonitrides I (joint session DS/MM/O)

DS 9.3: Talk

Wednesday, March 20, 2024, 16:00–16:15, A 053

Preparation of Magnetic MXenes by Fe intercalation — Tim Salzmann¹, Hanna Pazniak², Thierry Ouisse², Fabrice Wilhelm³, Andrei Rogalev³, Ralf Meckenstock¹, Ivan Tarasov¹, Michael Farle¹, and •Ulf Wiedwald¹ — ¹University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen, Germany — ²Université Grenoble Alpes, CNRS, Grenoble INP, LMGP, Grenoble, France — ³European Synchrotron Radiation Facility, Grenoble, France

Yet, the success of generating magnetic MXenes remains very limited since Fe, Co or Ni are incompatible with MAX phase precursors. We present an alternative approach to master magnetic properties of 2D MXenes by intercalating Fe into Ti₃C₂T_x MXene thin films on Si/SiO₂ in UHV conditions. Annealing of bare MXenes at T = 1023 K removes -F, -Cl and -OH. The intercalation of Fe is studied by depositing a 6 nm film on top of the MXenes and subsequent annealing. XRD shows an increase of the interplanar spacing between MXene sheets of 0.16 ± 0.02 nm. XPS and XANES reveal that Fe remains metallic and Fe diffuses 30 nm deep into the multilayers while MXenes keep intact. We study the magnetic properties by VSM and FMR. VSM suggests a new magnetic phase with M_S = 660 ± 80 kA/m and a Curie temperature of 485 K while angular-dependent FMR at 9 GHz and 300 K shows two ferromagnetic and one paramagnetic signals, which we address to the remaining Fe on top and the intercalated Fe in form of quasi 2D disks and isolated Fe ions. Funded by DFG (530103526). Support by CRC/TRR 270 (405553726) is acknowledged.

Keywords: MXenes; Fe intercalation; magnetic properties; diffusion