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Synthesis and magnetic studies of Ni-Zn ferrite nanoparticles

B. PARVATHEESWARA RAO1, A. MAHESH KUMAR1, K. H. RAO1, Y. L. N. MURTHY2, O. F. CALTUN3,* , I. DUMITRU4, L. SPINU4

Affiliation

  1. Department of Physics, Andhra University, Visakhapatnam 530 003, India
  2. Department of Organic Chemistry, Andhra University, Visakhapatnam 530 003, India
  3. Faculty of Physics, A.I. Cuza University, Iasi, 700506 Romania
  4. Advanced Materials Research Institute, University of New Orleans, 70148 New Orleans, USA

Abstract

Ni-Zn ferrite nanoparticles of the system, Ni0.65 Zn0.35 Fe2 O4, were synthesized by a soft chemical approach of co precipitation method. These nanoparticles were separated into four batches and they were annealed at different temperatures from 200 to 800oC for improved crystallization. All the samples were then characterized by X-ray diffraction, vibrating sample magnetometer and ferromagnetic resonance spectrometer techniques. The XRD patterns confirm spinel structures while the particle sizes, ranging from 9.9 to 15.7 nm, increase with the increase in heat treating temperature. The magnetization values are extremely small even at 10 kOe fields with vanished hysteresis at lower heat treating temperatures; thus leading close to the superparamagnetic nature. The resonance parameters deduced from the FMR spectra are in support of the magnetisation data..

Keywords

Ni-Zn Ferrites, Nanoparticles, Magnetic properties.

Submitted at: Sept. 5, 2006
Accepted at: Sept. 13, 2006

Citation

B. PARVATHEESWARA RAO, A. MAHESH KUMAR, K. H. RAO, Y. L. N. MURTHY, O. F. CALTUN, I. DUMITRU, L. SPINU, Synthesis and magnetic studies of Ni-Zn ferrite nanoparticles, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 5, pp. 1703-1705 (2006)