Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 47: Poster III
MA 47.19: Poster
Donnerstag, 21. März 2024, 15:00–18:00, Poster D
Switching of Magnetic Force Microscopy probes in homogeneous and non-homogeneous magnetic fields — •Rachappa Ravishankar1,2, Aniruddha Sathyadharma Prasad1, Michael Heigl3, Rudolf Schäfer1, Yana Vaynzof1,2, Manfred Albrecht3, Thomas Mühl1, and Volker Neu1 — 1Leibniz Institute for Solid State and Materials Research, 01069 Dresden — 2Dresden University of Technology, 01187 Dresden — 3University of Augsburg, 86159 Augsburg
In magnetic force microscopy's lift mode, long-range magnetic and electrostatic interactions dominate, and electrostatic contributions must be separated. This issue is resolved by switching magnetization MFM (SM-MFM), involving tip magnetization reversals between images allowing us to differentiate non-magnetic and pure magnetic forces by combining scanned data with original and reversed tip magnetization.
We investigate the switching of commercial MFM tips in both homogeneous and non-homogeneous fields. The homogeneous field in z-direction is provided by an electromagnet on which a high-coercive, ferrimagnetic TbFe is placed as a test sample. The non-homogeneous field is created by applying a current pulse into a micro coil patterned on a flat substrate. The magnetization states of the tip are probed on the TbFe sample and we observed a reverse, and low moment (partially magnetized) state. Finally, we characterize the tip magnetization by quantitative magnetic force microscopy (q-MFM) on a well-characterized Co/Pt sample in both reversed and partially magnetized states, determining the corresponding tip transfer function (TTF).
Keywords: Magnetic force microscopy; Switching magnetization; quantitative magnetic force microscopy; Tip transfer function; Micro coils