SKM 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 32: Magnetic Imaging Techniques I
MA 32.2: Vortrag
Mittwoch, 29. März 2023, 15:15–15:30, HSZ 401
Simultaneous Magnetic Field and Field Gradient Mapping of Hexagonal MnNiGa by Quantitative Magnetic Force Microscopy — Norbert H. Freitag1, Christopher F. Reiche2, Volker Neu1, Parul Devi3, Ulrich Burkhardt3, Claudia Felser3, Daniel Wolf1, Axel Lubk1, Bernd Büchner1, and •Thomas Mühl1 — 1Leibniz Institute for Solid State and Materials Research IFW Dresden, 01069 Dresden, Germany — 2Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, UT-84112, USA — 3Max Planck Institute for Chemical Physics of Solids Dresden, 01187 Dresden, Germany
A quantitative, single-pass magnetic force microscopy (MFM) technique is presented that maps one magnetic stray-field component and its spatial derivative at the same time. This technique uses a special cantilever design and a special high-aspect-ratio magnetic interaction tip that approximates a monopole-like moment. Experimental details, such as the control scheme, the sensor design, which enables simultaneous force and force gradient measurements, as well as the potential and limits of the monopole description of the tip moment are discussed. To demonstrate the merit of this technique for studying complex magnetic samples it is applied to the examination of polycrystalline MnNiGa bulk samples. In these experiments, the focus lies on mapping and analyzing the stray-field distribution of individual bubble-like magnetization patterns in a centrosymmetric [001] MnNiGa phase. The results indicate that the magnetic bubbles have a significant spatial extent in depth and a buried bubble top base.