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We report the results of an unpolarized small-angle neutron scattering (SANS)study on Mn-Zn ferrite (MZFO) magnetic nanoparticles with the aim to elucidatethe interplay between their particle size and the magnetization configuration.We study different samples of single-crystalline MZFO nanoparticles withaverage diameters ranging between 8 to 80 nm, and demonstrate that the smallestparticles are homogeneously magnetized. However, with increasing nanoparticlesize, we observe the transition from a uniform to a nonuniform magnetizationstate. Field-dependent results for the correlation function confirm that theinternal spin disorder is suppressed with increasing field strength. Theexperimental SANS data are supported by the results of micromagneticsimulations, which confirm an increasing inhomogeneity of the magnetizationprofile of the nanoparticle with increasing size. The results presenteddemonstrate the unique ability of SANS to detect even very small deviations ofthe magnetization state from the homogeneous one.

Size-dependent spatial magnetization profile of manganese-zinc ferrite Mn0.2Zn0.2Fe2.6O4 nanoparticles