SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 48: Magnetic Instrumentation and Characterization

MA 48.6: Vortrag

Freitag, 31. März 2023, 11:00–11:15, HSZ 401

Towards switchable probes for advanced Magnetic Force Microscopy — •Aniruddha Sathyadharma Prasad, Rachappa Ravishankar, Rudolf Schäfer, Volker Neu, Bernd Büchner, and Thomas Mühl — IFW Dresden, Helmholtzstraße 20, 01069 Dresden

In magnetic force microscopy (MFM) on samples consisting of non-homogeneous materials and challenging topography, the "magnetic" contrast is often overwhelmed by additional non-magnetic forces arising from differing contact potentials and from changes in the capacitive coupling due to topographical features. The elimination of such interfering signals can be done by a differential imaging process with inverted tip magnetization. Earlier implementations either require precise repositioning of the probe after external switching of the magnetization or application of global magnetic fields which can cause changes in the sample. In our work, we overcome these difficulties by switching the magnetization externally, and using feature matching in the post processing step to eliminate the need for precise repositioning. We also showcase first steps towards an in-situ switching of MFM probes for developing a high-speed differential process within the MFM instrument. This involves the design and fabrication of planar micro-coils capable of providing sufficient magnetic field to switch high quality Iron filled Carbon Nanotube (FeCNT) MFM probes. The switching was verified by applying the inhomogeneous field distributions of planar micro-coils in micromagnetic simulation studies on a FeCNT. Preliminary MFM results from an FeCNT probe interacting with such a coil are also presented.