Low-frequency complex magnetic susceptibility of magnetic composite microspheres in colloidal dispersion
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- 作者：Ben H. Erné ; Maria Claesson ; Stefano Sacanna ; Mark Klokkenburg ; Emile Bakelaar ; Bonny W.M. Kuipers
- 关键词：Complex magnetic susceptibility ; Brownian relaxation ; Magnetic dipole moment ; Microsphere ; Magnetic nanoparticle ; Colloidal dispersion ; Cobalt ferrite ; Silica ; Latex ; Magnetic susceptibility
- 刊名：Journal of Magnetism and Magnetic Materials
- 出版年：2007
- 出版时间：April 2007
- 年：2007
- 卷：311
- 期：1
- 页码：145-149
- 全文大小：373 K
文摘
A procedure is presented to determine the permanent magnetic dipole moment of composite microspheres containing magnetic nanoparticles with a blocked magnetic dipole moment. The composite particles are dispersed in a solvent, and the complex magnetic susceptibility is measured from 0.1 to 1000 Hz using a highly sensitive new setup. Composite particles with a permanent magnetic dipole moment are revealed by a characteristic frequency that corresponds to the Brownian rotation of the microspheres. From measured susceptibility spectra, we calculate the permanent magnetic dipole moment of recently developed cobalt ferrite-doped silica and latex microspheres.