Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Magnetism Poster A
MA 15.11: Poster
Dienstag, 2. April 2019, 10:00–13:00, Poster E
Magnetization hysteresis extraction from MFM images of ultra-thin SrRuO3-films — •Gerald Malsch1, Dmytro Ivaneiko1, Peter Milde1, Lena Wysocki2, Ionela Lindors-Vrejoiu2, and Lukas Eng1 — 1TU Dresden, Institute for Applied Physics, TU Dresden, 01062 Dresden, Germany — 2I. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany
Magnetic force microscopy (MFM) allows the imaging of the domain nucleation and growth during the magnetic switching of a ferromagnetic material. However, as the MFM signal strength cannot be directly translated to a local magnetization and the magnetization of the MFM tip itself is affected by the external field, the extraction of a full hysteresis loop from the analysis of MFM images is difficult. We present an algorithm using Otsu’s thresholding method and two fixed thresholds that allows the extraction of a full approximate hysteresis loop from MFM images alone.
We exemplify our method with SrRuO3 (SRO) thin films grown on a stepped (100)-SrTiO3 substrate. SRO shows a strong dependency of the magnetic properties on the layer thickness [1], which we demonstrate by correlating the hysteresis data with atomic force measurements, and separately obtaining a hysteresis for each thickness.
[1] K. Ishigami et al, Phys. Rev. B 92, 064402 (2015)