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Signatures of consolidated superparamagnetic and spin-glass behavior in magnetite-silver core-shell nanoparticles

Abstract

A detailed investigation of magnetization relaxation for silver coated magnetite nanostructures with three different types of magnetic behavior in single particle is presented. The magnetite nanoparticles of diameter ~6.5 nm synthesized via single phase emulsion was further coated with silver shell of thickness ~2 nm. The synthesized nanoparticles are found to be efficiently photoluminescent. The coating of silver generates a magnetically disordered spin layer at the interface of magnetic core and non-magnetic shell. This intermediate layer plays a significant role in dynamical magnetic response of nanoparticles under an external magnetic field. We present detailed magnetic measurements such as field and temperature dependent dc magnetization with zero-field-cooled and field-cooled protocols, ac susceptibility and time decay of magnetization relaxation along with their analysis using various formalism viz. Neel-Arrhenius, Vogel-Fulcher and Power law model. The relaxation analysis suggests consolidated presence of two characteristic relaxation times corresponding to superparamagnetic and spin-glass behavior for silver coated magnetite nanoparticles.

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Publication details

The article was accepted on 07 Nov 2018 and first published on 09 Nov 2018


Article type: Paper
DOI: 10.1039/C8NR08401G
Citation: Nanoscale, 2018, Accepted Manuscript
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    Signatures of consolidated superparamagnetic and spin-glass behavior in magnetite-silver core-shell nanoparticles

    P. Singh, M. Shukla and C. Upadhyay, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR08401G

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