Superparamagnetic Behavior of Zn and Al Substituted Cobalt Nanoferrites

  • J. Z. MsomiEmail author
  • S. J. Masuku
  • T. A. Nhlapo
  • T. Moyo
  • A. M. Strydom
  • D. Britz
  • T. P. Jili
Original Paper


Nanostructured Zn- and Al-doped cobalt spinel ferrites ZnxCo1-xFe2-xAlxO4 (0 ≤ x ≤ 1.0) with particle size in the range of 7–13 nm were synthesized by glycol-thermal reaction. XRD analysis confirmed single-phase cubic spinel structure with no impurity phases. The Mössbauer spectra for Zn- and Al-substituted fine powders could be resolved into two quadrupole doublets associated with 57Fe nuclei in paramagnetic spin phase. An unusual reducing magnetization with increasing particle size has been observed. The field cooled and zero field cooled magnetization measurements show superparamagnetic nanoparticles in the compounds investigated. The blocking temperatures (TB) are sensitive to particle size. Larger particles are blocked at higher temperatures compared to smaller particles at the same field.


Ferrites Nanoparticle Magnetization Mössbauer spectra 


Funding Information

J. Z. Msomi was financially supported by the National Research Foundation (NRF). AM Strydom was financially supported by the NRF (93549) and the FRC/URC of UJ.


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • J. Z. Msomi
    • 1
    Email author
  • S. J. Masuku
    • 1
  • T. A. Nhlapo
    • 2
  • T. Moyo
    • 2
  • A. M. Strydom
    • 3
  • D. Britz
    • 3
  • T. P. Jili
    • 1
  1. 1.Department of Physics and EngineeringUniversity of ZululandRichards BaySouth Africa
  2. 2.School of Chemistry and PhysicsUniversity of KwaZulu-NatalDurbanSouth Africa
  3. 3.Highly Correlated Matter Research Group, Physics DepartmentUniversity of JohannesburgAuckland ParkSouth Africa

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