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Magnetoresistance and electroresistance effects in Fe3O4 nanoparticle system
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
2014 (English)In: Journal of experimental nanoscience, ISSN 1745-8080, Vol. 9, no 4, 391-397 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2014. Vol. 9, no 4, 391-397 p.
Keyword [en]
magnetite, magnetoresistance, electroresistance, magnetic nanoparticles
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-218538DOI: 10.1080/17458080.2012.662657ISI: 000329777000007OAI: oai:DiVA.org:uu-218538DiVA: diva2:696063

Correction in: Journal of Experimental Nanoscience, 2014, Volume 9, Issue 7, pp. 762, DOI: 10.1080/17458080.2012.699222

Available from: 2014-02-12 Created: 2014-02-12 Last updated: 2014-07-22Bibliographically approved

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Sarma, D. D.
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Molecular and condensed matter physics
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