Тип публикации: статья из журнала
Год издания: 2009
Идентификатор DOI: 10.1134/S1063785009100022
Ключевые слова: MAGNETIC-PROPERTIES, NANOSIZED COFE2O4, ANISOTROPY, POWDERS, CURVES
Аннотация: We have studied magnetic nanoparticles of cobalt ferrite obtained by the extraction-pyrolysis method in a mesoporous silicon dioxide (MSM-41) molecular sieve matrix. The X-ray diffraction data show evidence for the formation of CoFe2O4 particles with a coherent scattering domain size of ~40 nm. Measurements of the magnetization curПоказать полностьюves showed that powders consisting of these nanoparticles are magnetically hard materials with a coercive field of Hc(4.2 K) = 9.0 kOe and Hc(300 K) = 1. 8 kOe and a reduced remanent magnetization of Mr/Ms(4.2 K) = 0.83 and Mr/Ms(300 K) = 0.49. The shape of the low-temperature (4.2 K) magnetization curves is adequately described in terms of the Stoner-Wohlfarth model for randomly oriented single-domain particles with a cubic magnetic anisotropy. © Pleiades Publishing, Ltd., 2009.
Журнал: Technical Physics Letters
Выпуск журнала: Vol. 35, Is. 10
Номера страниц: 882-884