Magnetic properties of oxide-coated iron nanoparticles synthesized by electrodeposition

Banerjee, S. ; Roy, S. ; Chen, J. W. ; Chakravorty, D. (2000) Magnetic properties of oxide-coated iron nanoparticles synthesized by electrodeposition Journal of Magnetism and Magnetic Materials, 219 (1). pp. 45-52. ISSN 0304-8853

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S03048...

Related URL: http://dx.doi.org/10.1016/S0304-8853(00)00417-0

Abstract

Nanometre-sized iron particles with diameters in the range 4.9-11.1 nm have been grown within a silica gel matrix by electrodeposition. Electron diffraction pattern shows the presence of an oxide (either Fe3O4 or γ-Fe2O3) shell on these particles. The variation of magnetization as a function of temperature has been analyzed using the Bloch equation. The Bloch exponent obtained as a function of particle size shows a trend different from that predicted theoretically. Zero field cooled (ZFC) and field cooled (FC) measurements on the nanocomposites have been carried out over the temperature range 2-300 K. Coercivity shows a decrease with increasing temperature. Also, a loop shift as a function of temperature is exhibited by the specimens. This shift disappears at a temperature around 50 K. This behavior is ascribed to an exchange interaction of the iron core with a ferrimagnetic oxide (either Fe3O4 or γ-Fe2O3) shell.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Iron Nanoparticles; Oxide Shell; Loop Shift
ID Code:7438
Deposited On:25 Oct 2010 11:32
Last Modified:28 May 2011 04:40

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