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

By Mathias Bersweiler, Philipp Bender, Laura G. Vivas, Martin Albino, Michele Petrecca, Sebastian Mühlbauer, Sergey Erokhin, Dmitry Berkov, Claudio Sangregorio, Andreas Michels and AMPHIBIAN Project ID:720853

Abstract

[EN] We report the results of an unpolarized small-angle neutron-scattering (SANS) study on Mn-Zn ferrite (MZFO) magnetic nanoparticles with the aim to elucidate the interplay between their particle size and the magnetization configuration. We study different samples of single-crystalline MZFO nanoparticles with average diameters ranging between 8 to 80 nm, and demonstrate that the smallest particles are homogeneously magnetized. However, with increasing nanoparticle size, we observe the transition from a uniform to a nonuniform magnetization state. Field-dependent results for the correlation function confirm that the internal spin disorder is suppressed with increasing field strength. The experimental SANS data are supported by the results of micromagnetic simulations, which confirm an increasing inhomogeneity of the magnetization profile of the nanoparticle with increasing size. The results presented demonstrate the unique ability of SANS to detect even very small deviations of the magnetization state from the homogeneous one.The authors acknowledge the Heinz Maier-Leibnitz Zentrum for provision of neutron beamtime. We thank Jörg Schwarz and Jörg Schmauch (Universität des Saarlandes) for the technical support with the hydraulic press and for the SEM investigations. It is also a pleasure to thank Dirk Honecker for fruitful discussions. This research was supported by the EU-H2020 AMPHIBIAN Project No. 720853. P.B. and A.M.thank the Fonds National de la Recherche of Luxembourg for financial support (CORE ANS4NCC grant).Peer reviewe

Topics: Ferrites, Magnetic nonoparticles, Micromagnetic modelling, Small angle neutron scattering, X-ray techniques, Condensed Matter, Materials Physics
Publisher: 'Japanese Society of Applied Entomology & Zoology'
Year: 2019
DOI identifier: 10.13039/501100000780
OAI identifier: oai:digital.csic.es:10261/199209
Provided by: Digital.CSIC
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