Spin Structures of Textured and Isotropic Nd-Fe-B-Based Nanocomposites: Evidence for Correlated Crystallographic and Spin Textures

A Michels, R. Weber, I. Titov, D. Mettus, A. Périgo, I. Peral, O. Vallcorba, J Kohlbrecher, K. Suzuki, Mamoru Ito, Takahiro A Kato, M. Yano

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We report the results of a comparative study of the magnetic microstructure of textured and isotropic Nd2Fe14B/α-Fe nanocomposites using magnetometry, transmission electron microscopy, synchrotron x-ray diffraction, and, in particular, magnetic small-angle neutron scattering (SANS). Analysis of the magnetic neutron data of the textured specimen and computation of the correlation function of the spin-misalignment SANS cross section suggests the existence of inhomogeneously magnetized regions on an intraparticle nanometer length scale, about 40-50 nm in the remanent state. Possible origins for this spin disorder are discussed: it may originate in thin-grain-boundary layers (where the material parameters are different than in the Nd2Fe14B grains), or it may reflect the presence of crystal defects (introduced via hot pressing), or the dispersion in the orientation distribution of the magnetocrystalline anisotropy axes of the Nd2Fe14B grains. X-ray powder diffraction data reveal a crystallographic texture in the direction perpendicular to the pressing direction - a finding which might be related to the presence of a texture in the magnetization distribution, as inferred from the magnetic SANS data.

Original languageEnglish
Article number024009
Number of pages10
JournalPhysical Review Applied
Issue number2
Publication statusPublished - 9 Feb 2017

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