Abstract
Nanoparticles of Ni0.2Zn0.6Cu0.2Fe2O4 were prepared by the standard co-precipitation method. The formation of nanocrystallinemixed spinel phase has been confirmed by x-ray diffractograms. The sizes of thenanoparticles were estimated in the range 7–30 nm, which was confirmed by transmissionelectron microscopy. Thermal variations of the real part of AC magnetic susceptibilitiesmeasured from 450 K down to 80 K and Mössbauer effect measurements at room temperatureand down to 20 K clearly indicate the presence of superparamagnetic particles in all thesamples. Specific saturation magnetizations measured by VSM are found to increasesteadily with the increase of average particle size. The coercive field obtained fromlow frequency measurements shows that in all the samples a small fraction ofparticles is not relaxed within the measuring time. For samples showing a lessdominating superparamagnetic behaviour, AC magnetic susceptibility data showed theexpected increase of blocking temperature with increase in particle size. Magneticanisotropy energy constants of the nanoparticles were estimated from the blockingtemperature and the values cannot be directly correlated with their particle sizes.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
