Figure 5.
Focusing principle of the effect of AMF on MNPs employing gradient-steady MF Bgr [163]. (a) Thermal fluctuations of MNP in the absence of external MF. The natural Earth MF BEarth is neglected; (b) rotational oscillations of MNP forced by activating AMF in the whole volume occupied by fields and particles; (c) oscillations of MNP forced by activating AMF in the presence of focused, gradient-steady MF Bgr are possible only in the region where B < Bgr. Blue line shows the dependence of Bgr on distance from FFP.