Fig. 4: Stationary collective states in the magnetic trap.
From: Thermally active nanoparticle clusters enslaved by engineered domain wall traps
a Sequence of optical microscope images showing different confined nanoparticles (from top to bottom) for Bz = 0 mT. The superimposed dashed line indicates the location of the Bloch wall, scale bar is 2 μm. b Two-dimensional density distribution of the particle positions projected onto the (x, y) plane. High (low) probabilities correspond to yellow (blue) regions. Scale bar at the bottom is 2 μm. c Probability distributions P(δx) of the particle displacement along the x-axis from experiments (left column) and numerical simulation (right column).
