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MA: Fachverband Magnetismus

MA 38: Micro- and Nanostructured Magnetic Materials

MA 38.3: Vortrag

Donnerstag, 30. März 2023, 12:00–12:15, HSZ 401

Towards magnetic MXenes via thermal activation of boldTi₃C₂T_x and Fe intercalation — •Tim Salzmann¹, Hanna Pazniak², 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, France

MXenes are 2D materials obtained from a MAX phase precursor. The Ti₃C₂T_x MXene surface is stabilized by a T_x termination in the form of −F, −Cl, =−O, −OH [1]. Ti₃C₂T_x MXenes deposited on Si(100)/SiO₂ are annealed at T=1023 K in ultrahigh vacuum removing −F, −Cl and −OH confirmed by in situ mass spectroscopy, and Auger electron spectroscopy (AES). Additionally, we find a reduction of interplanar spacing between MXene sheets (d_ini−d_ann=0.30± 0.04 nm) by X-ray diffraction (XRD). Subsequently, a 6 nm thick Fe film is deposited and annealed between 550 K and 1000 K. AES displays a linear decrease of the Fe concentration at the surface from 85% to 15% as a function of annealing temperature. The intercalation of Fe is confirmed by XRD measurements showing an increase of the interplanar spacing between MXene sheets (d_int−d_ann=0.16 ± 0.02 nm). In plane vibrating sample magnetometry reveals a saturation magnetization of 1728 ± 150 kA/m for the 6 nm Fe film on top of MXenes confirming bulk metallic Fe. After annealing up to 800 K, the magnetization decreases to 660 ± 80 kA/m and the Curie temperature to 485 K. Funded by DFG-Project-ID 405553726-TRR 270.

[1] James L. Hart et al., ACS Nanoscience Au 2022 2, 433-439