Enhanced Magnetic Permeability in Ni0.55−yCo y Zn0.35Mg0.10Fe2O4 Synthesized by Sol-Gel Method

  • D. R. S. Gangaswamy
  • G. S. V. R. K. Choudary
  • M. Chaitanya Varma
  • S. Bharadwaj
  • K. H. Rao
Original Paper


Growth in permeability with increasing cobalt content in Ni-Zn ferrite is a rare phenomenon. The rise in magnetic anisotropy associated with the cobalt, in general, suppresses the relative permeability of the material. However, cobalt substituted nickel-zinc ferrite of composition, Ni0.55−yCo y Zn0.35Mg0.10Fe2O4 (y= 0.00, 0.04, 0.08, 0.12, 0.16, 0.20), synthesized by sol-gel method, showed an enhanced relative initial permeability from 100 to 220 in the frequency range 60 Hz to 50 MHz with increasing cobalt content. The factors causing the permeability increase have been discussed in terms of the observed variations in particle size, saturation magnetization, and Curie temperature. The magnetization process under the influence of cobalt has been illustrated in detail with the help of dM/dH versus magnetization curves.


Ferrite Initial permeability Grain size Saturation magnetization Curie temperature 



One of the authors, Gangaswamy, is thankful to the Advanced Analytical Laboratory of Andhra University for rendering XRD and SEM facilities; Dr. M. SivaKumar, IIT Kanpur, for providing the room-temperature VSM facility; and NSTL-Visakhapatnam for providing dielectric measurements.

Compliance with Ethical Standards

Conflict of interests

The authors declare that they have no conflict of interests.


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Authors and Affiliations

  • D. R. S. Gangaswamy
    • 1
  • G. S. V. R. K. Choudary
    • 2
  • M. Chaitanya Varma
    • 3
  • S. Bharadwaj
    • 3
  • K. H. Rao
    • 4
  1. 1.Department of PhysicsGovernment PolytechnicAmudalavalasaIndia
  2. 2.Department of PhysicsBhavan’s Vivekananda CollegeSainikpuri, SecunderabadIndia
  3. 3.Department of PhysicsGIT Gitam UniversityVisakhapatnamIndia
  4. 4.RGU-IIIT NuzvidNuzividuIndia

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