Figure 1 | Scientific Reports

Figure 1

From: Three-dimensional close-to-substrate trajectories of magnetic microparticles in dynamically changing magnetic field landscapes

Figure 1

Acquisition of in and out of focus bright-field microscope images for axial position determination of SPPs. (a) Sketch of a focus sweep procedure. (b) SPPs are trapped within the local MFLs above a magnetic substrate with hh/tt magnetized stripe domains (indicated by black arrows). SPPs are moved from a position below the focal plane (c), through the focal plane (d) to a position above it (e). Exemplary images for micromer-M SPP (d = 3 µm) are shown for the three conditions. These images are used to calibrate the z-position of the SPP relative to the focal plane within transport experiments.

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