Journal of Nanomedicine & Nanotechnology

Disorder magnetic behavior of diluted Cu1-xZnxFe2O4 (x= 0.6 - 1.0) ferrites

6^th Global Experts Meeting on Nanomaterials and Nanotechnology

April 21-23, 2016 Valencia, Spain

Shahida Akhter, D P Paul, M A Hakim, S Akhter, S M Hoque, R Mathieu and P Nordblad

University of Chittagong, Bangladesh
Bangladesh University of Engineering and Technology, Bangladesh
Atomic Energy Centre, Bangladesh
Uppsala University, Sweden

Posters & Accepted Abstracts: J Nanomed Nanotechnol

Abstract:

Ferrites with spinel structure represent the magnetic disorder and exchange frustration among A & B-site moments resulting in a wide spectrum of magnetic structure such as ferrimagnetism (FM), antiferrimagnetism (AFM), local canted spin (LCS), reentrant spin glass (RSG) and spin glass (SG). Disorder behavior of Cu1-xZnxFe2O4 (x=0.6, 0.7, 0.8, 0.9 and 1.0) ferrites have been investigated by studying field-cooled (FC) and zero-field-cooled (ZFC) DC magnetization, temperature and frequency dependence of complex AC susceptibly, aging, rejuvenation and memory effect and magnetocaloric effect. The FC and ZFC magnetization and complex AC susceptibility studies suggest the presence of a magnetic phase transition from a ferromagnetic (FM) to a spin glass (SG) at a low temperature. Samples x=0.9 & 1.0 shows typical spin glass behavior with the manifestation of non-equilibrium dynamics of the spin glass such as aging, rejuvenation and memory effects. The magnetocaloric effect is observed in samples x=0.6, 0.7 & 0.8 near Curie temperature, Tc at which maximum magnetic entropy change (�?S) occurs suggesting as a magnetic refrigerant materials. These features of the magnetic properties of dilute Cu-Zn ferrites are discussed from the view point of the above mentioned various type of disorder.

Biography :

Email: shahida212@yahoo.com