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Anomalous magnetic behavior in Ni80Cr20 nanoparticles prepared by physical and chemical methods
Vishvakarma S., , Ranjan P.,
Published in Elsevier
Volume: 141
We report a detailed study of the structural and magnetic properties of Ni80Cr20 fine particles prepared by physical methods, such as mechanical alloying, wire explosion process (WEP), and chemical methods like sodium borohydride reduction, polyol method. From the analysis of structural and microstructural data, phase formation with the desired composition is confirmed in the particles prepared by the WEP. A comparative study of magnetization data of bulk and nanoparticles of Ni80Cr20 suggests that a weak magnetic moment develops in nanoparticles due to finite-size effects. Analysis of magnetization data suggests a superparamagnetic (SPM) behavior in the smallest sized (34 nm) particles prepared by WEP, while nanoparticles prepared by other methods show ferromagnetic ground state. Further, it is shown that the origin of weak magnetic moment and development of SPM state in the nanoparticles is due to uncompensated surface spins with a negligible interaction effect. © 2021 Elsevier Ltd
About the journal
JournalData powered by TypesetMaterials Research Bulletin
PublisherData powered by TypesetElsevier
Open AccessYes