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Magnetic properties of Co1+yAl2−yO4–SiO2 nanocomposites synthesized by sol–gel method

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Abstract

Nanocomposites made of magnetic spinel oxide Co1+yAl2−yO4 particles dispersed in an amorphous SiO2 matrix were synthesized by a sol–gel technique. Samples with various mass fractions of Co1+yAl2−yO4 in composite x, and with various Co concentrations in spinel y were studied. The grain sizes were below 100 nm with a large size distribution. The paper represents thorough investigation of magnetic properties, but special attention was given to peculiar effects and low temperature magnetic frozen states. Magnetic measurements reveal multiple magnetic ground states at the lowest temperature. The frequency dependent ac susceptibility measurements indicate spin-glass behavior of these ground states at low temperatures. The samples, with higher concentration x of Co1+yAl2−yO4 in SiO2, showed very similar Curie–Weiss paramagnetic behavior with antiferromagnetically interacting Co ions (θ ≈ −100 K). Other samples, with lower x, showed complex behavior, spin-glass magnetic freezing at the lowest temperatures and lower absolute value of θ and consequently lower exchange constant.

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Acknowledgments

Financial support for this study was granted by the Ministry of Science of the Republic of Serbia, project No 172026.

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Authors and Affiliations

  1. Vinča Institute of Nuclear Sciences, University of Belgrade, P.O.Box 522, 11001, Belgrade, Serbia

    Dušan Milivojević, Branka Babić-Stojić, Vukoman Jokanović, Dušan Branković, Nataša Jović & Svetlana Čupić

  2. Institute of Mathematics, Physics and Mechanics, Jadranska 19, 1000, Ljubljana, Slovenia

    Zvonko Jagličić

  3. Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, 11120, Belgrade, Serbia

    Dušan Kojić

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  1. Dušan Milivojević
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  2. Branka Babić-Stojić
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Correspondence to Dušan Milivojević.

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Milivojević, D., Babić-Stojić, B., Jokanović, V. et al. Magnetic properties of Co1+yAl2−yO4–SiO2 nanocomposites synthesized by sol–gel method. J Sol-Gel Sci Technol 63, 56–64 (2012). https://doi.org/10.1007/s10971-012-2763-1

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