Graph of magnitude of magnetic force between one nanoparticle and an aggregate. Particles are attached to each other what means that the distance between particles is equal to the sum of radii of both particles. The triangle marks represent data computed by averaging of the positions, directions, and magnitudes of vectors of polarization of all nanoparticles in the examined aggregate. The magnetic force is then computed between the nanoparticle and the averaged aggregate. The squared marks represent data computed by summation of all interactions between the examined nanoparticle and every nanoparticle from the examined aggregate. Every nanoparticle has random position and direction of vector of polarization. The particles are attached to each other, otherwise distance between the particles is the sum of radii of particles.
Rosická and Šembera Nanoscale Research Letters 2011 6:527 doi:10.1186/1556-276X-6-527