Core-shell magnetic structure of La.sub.1-x./sub.Sr.sub.x./sub.MnO.sub.3+δ./sub. nanocrystallites

0485366 - FZÚ 2018 RIV US eng J - Článek v odborném periodiku
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
Grant CEP: GA ČR GA15-10088S
Institucionální podpora: RVO:68378271
Klíčová slova: magnetic nanoparticles * neutron diffraction * perovskite manganite * phase separation
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 1.467, rok: 2017

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.

Trvalý link: http://hdl.handle.net/11104/0280411