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MA: Fachverband Magnetismus
MA 6: Magnetic Imaging Techniques I
MA 6.3: Talk
Monday, March 9, 2026, 10:00–10:15, POT/0361
Switchable magnetic nanowire probes for differential magnetic force microscopy — Florian Sandbaumhüter1,2, •Aniruddha Sathyadharma Prasad1,2, Rachappa Ravishankar1,2, Volker Neu1, Bernd Büchner1,2, and Thomas Mühl1 — 1IFW Dresden — 2TU Dresden
Recent work on magnetic force microscopy (MFM) has highlighted the need to implement a differential MFM technique to better eliminate interfering electrostatic and topographical crosstalk from MFM images. In addition, the use of specialized MFM probes containing iron-filled carbon nanotubes (FeCNTs) as the sensing element has enabled easy quantitative imaging of magnetic fields and field gradients [1]. In this talk, we demonstrate in-situ differential MFM in a reversed tip-sample arrangement. This is based on our switchable magnetic probes which consist of FeCNTs attached to micron-sized electromagnets, i.e. planar microcoils [2]. The large field gradients of these microcoils make sure that there is only a minimal effect on the sample being measured. Furthermore, the highly inhomogeneous fields produced by our microcoils also provide a new playground for studies of domain wall motion in ferromagnetic nanowires.
[1] Freitag, Norbert H., et al. Communications Physics 6, 11 (2023).
[2] Sathyadharma Prasad, Aniruddha, et al. Communications Materials 6, 164 (2025).
Keywords: MFM; ferromagnetic nanowires; MEMS; magnetic fields; lithography