Quantization of magnetic flow created by nanoparticle of magnetite

Magnetic flow O created by nanoparticle of magnetite possessing minimal observed magnetic moment P min = 10-19 Am2 was estimated. Assuming thickness of layer in that circulated currents of electrons producing magnetic field to be 0.75 of atomic radius of ion of Fe+2, we get value of O to be equal to quantum of magnetic flow of 210-15 Wb.