Feroz A Khan
Bangladesh University of Engineering and Technology, Bangladesh
Title: Study of structural and magnetic properties of manganese doped cobalt ferrite nanoparticles for high frequency and sensor applications
Biography
Biography: Feroz A Khan
Abstract
The structural, magnetic and electrical properties of Mn doped cobalt ferrites Co1-xMnxFe2O4 have been investigated. The samples are found to be of spiel structure. The DC and AC magnetic properties have been measured at different temperatures. A significant change in the electrical and magnetic properties has been observed with increasing Mn content in the sample. It is observed that the ferri-ferromagnetic Curie temperature is tunable by changing the Mn content in the sample. The optimum point is yet to be determined as the research work is in progress. However primary investigation shows that for transition from ferri-to-ferro and ferrito-para the bifurcation point shifts towards the low temperature side. The ac electrical properties have also shown strong frequency dependence. The variation of real part of the dielectric constant ε’ with frequency at room temperature for all samples of composition Co0.75Mn0.25Fe2O4(CMF2),Co1Mn0.25Fe1.750O4(CFM2), Co1.25Mn0.25Fe1.75O4 (CMFZ2), CoFe2O4 (parent) and also of a bi-layer sample CMF-2+CFM-2. It is observed that the dielectric constants of all the investigated samples have gone through a maximum at two different frequency bands 1 MHz- 4.5 MHz and 7.5 MHz.-10.5 MHz. This is attributed to the electronic, ionic, dipolar and interfacial polarizations that occur at the tetrahedral and octahedral sites.