ACTA

Magnetic Properties of La_0.8K_0.2MnO₃ Nanoparticles

M. Mihalik^a, M. Zentková^a, J. Briančin^c, M. Fitta^d, M. Mihalik jr.^a, J. Lazúrová^a, M. Vavra^a,b
^aInstitute of Experimental Physics SAS, Watsonova 47, 040 01 Košice, Slovakia
^bInstitute of Chemistry, Faculty of Science, P.J. Šafarik University, Moyzesova 11, 041 54 Košice, Slovakia
^cInstitute of Geotechnics SAS, Watsonova 45, 040 01 Košice, Slovakia
^dInstitute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, Kraków, Poland

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Magnetic properties of La_0.8K_0.2MnO₃ have been studied on nanoparticles prepared by glycine-nitrate method. Crystal structure and particles size were modified by heat treatment. Crystal structure changes from orthorhombic (space group Pbma) to rhombohedral (space group R-3c) after annealing at 600°C/2 hours. The average size of particle varies with annealing from about 30 nm to 135 nm. The Curie temperature T_C and the saturated magnetization μ_s increase with annealing. The exchange bias effect was observed on samples with particles size smaller than 60 nm.

DOI: 10.12693/APhysPolA.126.312
PACS numbers: 75.50.-y, 75.47.Lx, 75.30.-m, 75.30Kz