Magnetic properties of oxide-coated iron nanoparticles synthesized by electrodeposition
Journal
Journal of Magnetism and Magnetic Materials
Journal Volume
219
Journal Issue
1
Pages
45-52
Date Issued
2000
Author(s)
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.
Other Subjects
Coercive force; Crystal growth; Electrodeposition; Ferrimagnetic materials; Magnetization; Nanostructured materials; Particle size analysis; Silica gel; Synthesis (chemical); Thermal effects; Nanoparticles; Iron
Type
journal article