Banerjee, S.S.BanerjeeRoy, S.S.RoyJENG-WEI CHENChakravorty, D.D.Chakravorty2018-09-102018-09-10200003048853http://www.scopus.com/inward/record.url?eid=2-s2.0-0034238893&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/289373Nanometre-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.Coercive force; Crystal growth; Electrodeposition; Ferrimagnetic materials; Magnetization; Nanostructured materials; Particle size analysis; Silica gel; Synthesis (chemical); Thermal effects; Nanoparticles; Ironjournal article10.1016/S0304-8853(00)00417-02-s2.0-0034238893