Domain size correlated magnetic properties and electrical impedance of size dependent nickel ferrite nanoparticles

• DOI: 10.1063/1.4906101
• Publication Date: 2015-01-13T21:27:58Z
• Authors: Ramesh B. Kamble; Vaibhav Varade; K. P. Ramesh; V. Prasad
• Keywords: Single domain

We report here the investigations on size dependent variation of magnetic properties nickel ferrite nanoparticles. Nickel nanoparticles different sizes (14 to 22 nm) were prepared by sol-gel route at annealing temperatures. They are characterized TGA-DTA, XRD, SEM, TEM and Raman spectroscopy techniques for confirmation temperature phase formation, thermal stability, crystallinity, morphology structural status The magnetization studies revealed that saturation (Ms), retentivity (Mr) increase, while coercivity (Hc) anisotropy (Keff) decrease as particle increases. observed value Ms is found be relatively higher a nm. In addition, we have estimated domain using data correlated average size. calculated closely matching with from XRD. Impedance was employed study samples in an equivalent circuit understand their transport phenomena. It shows exhibit non-Debye behavior increasing due influence disorders, surface effects, grain boundaries, etc.