Figure 9.

Graph of magnitude of magnetic force between one nanoparticle and an aggregate. Particles are in distance to each other of one thousand multiple of the radius of examined aggregate. 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.

Rosick√° and ҆embera Nanoscale Research Letters 2011 6:527   doi:10.1186/1556-276X-6-527
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