Apparent superdiamagnetism of diamagnetic spheres in ferrofluids

Autor:	P.C. Fannin, A.T Skjeltorp, S.W. Charles
Rok vydání:	1999
Předmět:	Condensed Matter::Soft Condensed Matter Permittivity Ferrofluid Materials science Condensed matter physics Volume fraction Superdiamagnetism Diamagnetism SPHERES Dielectric Condensed Matter Physics Magnetic susceptibility Electronic Optical and Magnetic Materials
Zdroj:	Journal of Magnetism and Magnetic Materials. 201:113-115
ISSN:	0304-8853
DOI:	10.1016/s0304-8853(99)00069-4
Popis:	The dispersion of non-magnetic spheres in a ferrofluid results in the formation of holes with an apparent induced diamagnetic moment, which we refer to as `Superdiamagnetism'. This effect is demonstrated by means of comparison of the results of AC susceptibility measurements performed on colloidal samples of a water-based ferrofluid with and without monodispersed polystyrene spheres. The use of the magnetic analogue of the Gunther and Heinrich formula for the complex dielectric constant of a composite dielectric enabled the volume fraction of spheres in the composite mixture to be determined. It is demonstrated that the observed phenomenon is not simply a dilution effect.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::93090a0187b864f07feb615846e06a07 https://doi.org/10.1016/s0304-8853(99)00069-4 Zobrazit plný text záznamu Full Text from ScienceDirect