0485366 - FZÚ 2018 RIV US eng J - Journal Article
Belozerova, N.M. - Kichanov, S.E. - Kozlenko, D. P. - Kaman, Ondřej - Jirák, Zdeněk
Core-shell magnetic structure of La_1-xSr_xMnO_3+δ nanocrystallites.
IEEE Transactions on Magnetics. Roč. 53, č. 11 (2017), s. 1-5, č. článku 2300905. ISSN 0018-9464. E-ISSN 1941-0069
R&D Projects: GA ČR GA15-10088S
Institutional support: RVO:68378271
Keywords : magnetic nanoparticles * neutron diffraction * perovskite manganite * phase separation
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 1.467, year: 2017 ; AIS: 0.365, rok: 2017
DOI: https://doi.org/10.1109/TMAG.2017.2700394

Magnetic La1-xSrxMnO3+δparticles of composition x = 0.36 and average size of 40 nm have been prepared from the oxidizing flux of sodium nitrite at ≈500 °C. Detailed magnetic and neutron diffraction measurements have been performed on raw nanoparticles and particles subjected to mild acid leaching. Based on these experiments and X-ray fluorescence analysis of the respective products, we conclude on the core-shell magnetic structure of the molten-salt-prepared particles, consisting of ferromagnetic (FM) ordering in the interior and A-type antiferromagnetic (AFM) ordering in the intermediate shell just below the outermost, magnetically disordered layer. The reason for such complex arrangement, unprecedented in sol-gel-prepared manganite nanoparticles of the same composition, is in a certain radial distribution of La, Sr cations, and an increased oxygen stoichiometry related to the presence of extra oxygen atoms covalently bound at the particle surface.

Permanent Link: http://hdl.handle.net/11104/0280411