https://scholars.lib.ntu.edu.tw/handle/123456789/289373
標題: | Magnetic properties of oxide-coated iron nanoparticles synthesized by electrodeposition | 作者: | Banerjee, S. Roy, S. JENG-WEI CHEN Chakravorty, D. |
公開日期: | 2000 | 卷: | 219 | 期: | 1 | 起(迄)頁: | 45-52 | 來源出版物: | Journal of Magnetism and Magnetic Materials | 摘要: | 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. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-0034238893&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/289373 |
ISSN: | 03048853 | DOI: | 10.1016/S0304-8853(00)00417-0 | SDG/關鍵字: | Coercive force; Crystal growth; Electrodeposition; Ferrimagnetic materials; Magnetization; Nanostructured materials; Particle size analysis; Silica gel; Synthesis (chemical); Thermal effects; Nanoparticles; Iron |
顯示於: | 物理學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。