Tuning the Magnetic Behavior of Sr2+doped Cobalt Nickle ferrite Useful for Magnetic Storage Applications

In this work we present the structural, X-ray photoelectron spectroscopy and Magnetic properties of Sr2+ doped Co0.5Ni0.5_xSrxFe2O4 (x = 0.1; 0.2; 0.3; 0.4; 0.5) nanomaterial prepared by chemical synthesis method. The phase and crystallinity were studies by using X-ray diffraction (XRD). Further the elemental composition and chemical binding in five spinel samples investigated by using X-ray photoelectron spectroscopy (XPS). XPS reveals that Ni2+ ions with a high content of nickel in the studied spinel's occupy octahedral and tetrahedral positions. At a low nickel content in the sample, Ni2+ ions predominantly occupy tetrahedral sites. The Fe2p spectra of the spinel's under study contain contributions from Fe2+ and Fe3+ ions, and the content of Fe2+ ions correlates with the fraction of Sr2+ ions in the samples. As the fraction of Sr2+ ions in the samples increases, the contribution of Fe2+ ions to the Fe2p spectrum decreases. The profiles of the Fe2p and Co2p spectra are distorted by the contribution of the CoLMM and FeLMM Auger spectra, respectively. The.Sr3d spectra of spinel's contain contributions from surface strontium atoms and atoms located in defective areas of the spinel crystal lattice. The vibrating magnetometer study of all the samples exhibits ferromagnetic nature and useful for permanent magnets.