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

  • Dušan Milivojević
  • Branka Babić-Stojić
  • Vukoman Jokanović
  • Zvonko Jagličić
  • Dušan Branković
  • Nataša Jović
  • Svetlana Čupić
  • Dušan Kojić
Original paper


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.


Magnetic materials Sol–gel preparation Nanocomposites Spin glass ac susceptibility 



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


  1. 1.
    Tristan N, Zestrea V, Behr G, Klingeler R, Buchner B, Krug von Nidda HA, Loidl A, Tsurkan V (2008) Phys Rev B 77:094412FGoogle Scholar
  2. 2.
    Krimmel A, Tsurkan V, Sheptyakov D, Loidl A (2006) Phys B 378:583CrossRefGoogle Scholar
  3. 3.
    Zaharko O, Cervellino A, Tsurkan V, Christensen NB, Loidl A (2010) Phys Rev B 81:064416CrossRefGoogle Scholar
  4. 4.
    Baker C, Ismat Shah S, Hasanain SK (2004) J Magn Magn Mater 280:412CrossRefGoogle Scholar
  5. 5.
    Sato M, Kohiki S, Hayakawa Y, Sonda Y, Babasaki T, Deguchi H, Mitome M (2000) J Appl Phys 88:2771CrossRefGoogle Scholar
  6. 6.
    Takada S, Fujii M, Kohiki S, Babasaki T, Deguchi H, Mitome M, Oku M (2001) Nano Lett 1:379CrossRefGoogle Scholar
  7. 7.
    Poddar A, Bhowmik RN, De A, Sen P (2009) J Magn Magn Mater 321:2015CrossRefGoogle Scholar
  8. 8.
    Corrias A, Casula MF (2011) In: Aegerter AM (ed) Aerogels handbook, 1st edn. Springer, New YorkGoogle Scholar
  9. 9.
    Resnick DA, Gilmore K, Idzerda YU, Klem MT, Allen M, Douglas T, Arenholz E, Young M (2006) J Appl Phys 99:08Q501Google Scholar
  10. 10.
    Casu A, Casula MF, Corrias A, Falqui A, Loche D, Marras S (2007) J Phys Chem C 111:916CrossRefGoogle Scholar
  11. 11.
    Goldberg S, Davis AJ, Hem DJ (1995) ch. 7 In: Garrison S (ed) The environmental chemistry of aluminum, 2nd edn. CRC Lewis Publishers, Boca RatonGoogle Scholar
  12. 12.
    Roth WL (1964) J Phys Chem Solids 25:1CrossRefGoogle Scholar
  13. 13.
    Dutta P, Seehra MS, Thota S, Kumar J (2008) J Phys: Condens Matter 20:015218CrossRefGoogle Scholar
  14. 14.
    Tristan N, Hemberger J, Krimmel A, Krug von Nidda HA, Tsurkan V, Loidl A (2005) Phys Rev B 72:174404CrossRefGoogle Scholar
  15. 15.
    Maljuk A, Tsurkan V, Zestrea V, Zaharko O, Cervelino A, Loidl A, Argyriou DN (2009) J Cryst Growth 311:3997CrossRefGoogle Scholar
  16. 16.
    Tielens F, Calatayud M, Franco R, Recio JM, Perez-Ramirez J, Minot C (2006) J Phys Chem B 110:988CrossRefGoogle Scholar
  17. 17.
    Suzuki T, Nagai H, Nohara M, Takagi H (2007) J Phys: Condens Matter 19:145265CrossRefGoogle Scholar
  18. 18.
    Mydosh JA (1993) Spin glasses: an experimental introduction. Taylor and Francis, LondonGoogle Scholar
  19. 19.
    Martin-Gonzales MS, Garcia MA, Lorite I, Costa-Kramer JL, Rubio-Marcos F, Carmona N, Fernandez JF (2010) J Electroch Soc 157:E31CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Dušan Milivojević
    • 1
  • Branka Babić-Stojić
    • 1
  • Vukoman Jokanović
    • 1
  • Zvonko Jagličić
    • 2
  • Dušan Branković
    • 1
  • Nataša Jović
    • 1
  • Svetlana Čupić
    • 1
  • Dušan Kojić
    • 3
  1. 1.Vinča Institute of Nuclear SciencesUniversity of BelgradeBelgradeSerbia
  2. 2.Institute of Mathematics, Physics and MechanicsLjubljanaSlovenia
  3. 3.Faculty of Mechanical EngineeringUniversity of BelgradeBelgradeSerbia

Personalised recommendations