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Low-frequency complex magnetic susceptibility of magnetic composite microspheres in colloidal dispersion |
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| Authors: | Ben H Erné Maria ClaessonStefano Sacanna Mark KlokkenburgEmile Bakelaar Bonny WM Kuipers |
| Institution: | Van ’t Hoff Laboratory for Physical and Colloid Chemistry, Chemistry Department, Science Faculty, Utrecht University, The Netherlands |
| Abstract: | 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. |
| Keywords: | Complex magnetic susceptibility Brownian relaxation Magnetic dipole moment Microsphere Magnetic nanoparticle Colloidal dispersion Cobalt ferrite Silica Latex Magnetic susceptibility |
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