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a) Low frequency hysteresis loops of dilute clusters of spherical magnetite nanoparticles with cubic anisotropy and nonmagnetic shell thickness tsh = 20 nm for various particle diameters: 1) D = 30 nm, 2) D = 35 nm, 3) D = 40 nm, 4) D = 45 nm, 5) D = 55 nm; b) hysteresis loop evolution as a function of nonmagnetic shell thickness at the fixed particle diameter D = 45 nm: 1) tsh = 20 nm, 2) tsh = 30 nm, 3) assembly of noninteracting nanoparticles.
