ACTA

Influence of the Grain Size on the Magnetic Properties of TbMnO₃

W. Bażela^a, M. Dul^a, V. Dyakonov^b,c, Ł. Gondek^d, A. Hoser^e, J.-U. Hoffmann^e, B. Penc^f, A. Szytuła^f, Z. Kravchenko^c, I. Nosalev^c and A. Zarzycki^g
^aInstitute of Physics, Technical University of Cracow, Podchorążych 1, 30-084 Kraków, Poland
^bInstitute of Physics, PAS, al. Lotników 32/46, 02-668 Warszawa, Poland
^cA.A. Gałkin Donetsk Physico-Technical Institute, NANU, R. Luxemburg 72, 83114 Donetsk, Ukraine
^dAGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Mickiewicza 30, 30-059 Kraków, Poland
^eHelmholtz-Zentrum Berlin für Materialen and Energie GmbH, Hahn-Meitner-Platz 1, 14-109 Berlin, Germany
^fM. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
^gH. Niewodniczański Institute of Nuclear Physics PAS, Radzikowskiego 152, 31-342 Kraków, Poland

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The magnetic properties including magnetic structure of poly and nano samples of TbMnO₃ are determined. All the samples investigated are antiferromagnets. In these samples the Mn ad Tb moments order antiferromagnetically at different temperatures and form: modulated magnetic structure described by the propagation vector k=(k_x,0,0) with different value of k_x for the Mn and Tb sublattices. Comparison of the data for poly and nano samples indicates the decrease of the moment and increase of the k_x component of propagation vector in the nano specimens. The wide Bragg peak related to the Tb sublattice suggests that the magnetic order has the claster-like character. The magnetic moments value in both sublattices is smaller, whereas the k_x values are larger for nano samples.

DOI: 10.12693/APhysPolA.121.785
PACS numbers: 61.05.Cp, 61.05.F-, 61.05.J-, 75.30.kz, 75.50.Ee, 75.50.-y