ACTA

Effect of Nd³⁺ Doping on Magnetic and Dielectric Properties of SrFe₁₂O₁₉ Hexaferrite Synthesized by Coprecipitation Method

A. Hilczer^a, K. Pasińska^b, E. Markiewicz^a, A. Pietraszko^b, B. Andrzejewski^a
^aInstitute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland
^bInstitute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-422 Wrocław, Poland

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Magnetic and dielectric properties of hexagonal ferrites important for applications in microwave absorbers are strongly determined by the processing conditions. We studied dielectric and magnetic response of Sr_1-xNd_xFe₁₂O₁₉ (x=0, 0.03, 0.05, 0.07, 0.09) solid solutions obtained by coprecipitation method. The structure of the samples was controlled by X-ray diffraction and scanning electron microscope images revealed that the powder is a mixture of small nanograins and crystallites of 500 nm-1 μm in size. Nd³⁺ doping was found to result in an increase in the coercive field which we would like to relate to the domain wall pinning. The doping-induced changes are monotonous with x up to 0.07. The observed dispersion of permittivity was found to be correlated with the frequency behaviour of electric conductivity of the samples.

DOI: 10.12693/APhysPolA.133.669
PACS numbers: 75.50.Gg, 75.60.Ej, 75.75.+a, 81.20.Fw