Fig. 3: Magnetic simulations of interaction of magnetic microparticles under AMF.
From: Self-healable printed magnetic field sensors using alternating magnetic fields
a Static simulations revealing interaction between two Ni81Fe19 microparticles exposed to a homogeneous external magnetic field. a1 Magnetic stray field distribution and a2 force distribution as two microparticles are apart, corresponding to a very early stage of applying AMF. B0 indicates the saturation field of Ni81Fe19 microparticles. a3 Force distribution as two microparticles are in contact. Pink arrows qualitatively portray the main direction of the net force experienced by microparticles. Scale bars in a): 1 μm. b Dynamic simulations revealing interaction between 27 Ni81Fe19 microparticles exposed to AMF. Screenshots of microparticles interaction in Movie 1 after applying AMF for b1 0 μs, b2 30 μs, and b3 500 μs. Particles’ colors aid the eyes for tracking the time evolution of the particle’s positions. Scale bars in b): 4 μm. Red arrows show the direction of magnetic moments. Coordinate reference frame is shown with black arrows in panel d. Magnetic fields are set to be along the z direction. c Screenshots showing the real-time interaction of Ni81Fe19 microparticles under AMF in experiment: c1 dispersion; c2 attraction; c3 oscillation; c4 connection. The values on the top-right corner are the time since applying AMF. Scale bars: 400 μm.
