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Superparamagnetic behavior of ZnFe2O4 nanoparticles as evidenced by EPR

O. RAITA1, A.POPA1,* , D.TOLOMAN1, V.BADILITA2, R. R. PITICESCU2, L. M. GIURGI1

Affiliation

  1. National Institute for Research and Development of Isotopic and Molecular Technologies 400293 Cluj-Napoca, P. O. Box 700, Romania
  2. National R&D Institute for Nonferous and Rare Metals, 102 Biruintei Blvd., Pantelimon, Ilfov, Romania

Abstract

We report the investigation by electron paramagnetic resonance (EPR) in X and Q- bands of the nature of magnetic interactions present in ZnFe2O4 nanoparticles. EPR spectrum consists of a single broad line. In the investigated temperature range and both bands, the resonance field shifts to lower fields and the line broadens with the decrease of temperature. These features are the signature for the presence of a superparamagnetic state in ZnFe2O4. From magnetic measurements, a superparamagnetic behavior for ZnFe2O4 powders was confirmed..

Keywords

electron paramagnetic resonance, spinel, magnetic behavior, nanoparticles.

Submitted at: Jan. 8, 2015
Accepted at: Sept. 9, 2015

Citation

O. RAITA, A.POPA, D.TOLOMAN, V.BADILITA, R. R. PITICESCU, L. M. GIURGI, Superparamagnetic behavior of ZnFe2O4 nanoparticles as evidenced by EPR, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 9-10, pp. 1314-1318 (2015)