Abstract
The magnetic properties of dispersions of magnetic silica microspheres have beeninvestigated by measuring the magnetization curves and the complex magneticsusceptibility as a function of frequency and field amplitude. The silica spheres appearto have a net permanent magnetic dipole moment, even in zero field, which isincreased significantly after a temporary exposure of the silica colloids to a saturatingmagnetic field. The magnetic properties of the microparticles in zero field arediscussed in terms of the number and the orientations of the embedded nanoparticledipoles along an easy axis of magnetization in the absence of an external field.
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