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Magnetoresistance and electroresistance effects in Fe3O4 nanoparticle system

Kumar, Anil P and Ray, Sugata and Chakraverty, S and Sarma, DD (2014) Magnetoresistance and electroresistance effects in Fe3O4 nanoparticle system. In: JOURNAL OF EXPERIMENTAL NANOSCIENCE, 9 (4). pp. 391-397.

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Official URL: http://dx.doi.org/10.1080/17458080.2012.662657


Nearly monodisperse spherical magnetite (Fe3O4) nanoparticles are prepared by colloidal chemistry route. Magnetic and electronic transport properties of the annealed pellets of these nanoparticles are reported. Effect of external magnetic and electric fields on the magnetic and transport properties of the material are studied as a function of temperature. We find that the highest resistance state of the ferromagnetic system occurs at a magnetic field which is approximately equal to its magnetic coercivity; this establishes the magnetoresistance (MR) in this system to be of the conventional tunnelling type MR as against the spin-valve type MR found more recently in some ferromagnetic oxide systems. The material also shows electroresistance (ER) property with its low-temperature resistance being strongly dependent on the excitation current that is used for the measurement. This ER effect is concluded to be intrinsic to the material and is attributed to the electric field-induced melting of the charge-order state in magnetite.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the TAYLOR & FRANCIS LTD,ENGLAND
Keywords: magnetite; magnetoresistance; electroresistance; magnetic nanoparticles
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 10 Feb 2014 10:25
Last Modified: 10 Feb 2014 10:26
URI: http://eprints.iisc.ac.in/id/eprint/48351

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