Beschreibung:
<jats:p>Motivated by the difficulty of obtaining quantitative micromagnetic results using current magnetic force microscope imaging techniques, we have employed an imaging mode where the oscillation amplitude of the tip was recorded versus the tip–sample separation as the tip was raster scanned over a magneto-optic sample. The mechanical response of the cantilever depends on the magnetic, but also on topographic, interferometric and nonmagnetic dissipative interactions between the tip and the sample. We separated the magnetic signal from the other interactions and analyzed it in terms of a refined theory of magnetic force microscope response. The extracted magnetic signal, which we refer to as a force gradient map, showed some features not apparent in conventional magnetic force microscope images and was well fit by a simple micromagnetic model of the magneto-optic sample.</jats:p>