Magnetic properties of magnetite ultrafine particles prepared by W/O microemulsion method

The magnetizations of a magnetite colloid prepared by a Water/Oil microemulsion method were measured. Magnetization curves are not represented by a simple Langevin function, but are given by a complex formula incorporating the surface condition of ultrafine particles. The temperature dependence of t...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1987-05, Vol.26 (5), p.713-717
Main Authors: BANDOW, S, KIMURA, K, KON-NO, K, KITAHARA, A
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Other techniques and industries
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Summary:The magnetizations of a magnetite colloid prepared by a Water/Oil microemulsion method were measured. Magnetization curves are not represented by a simple Langevin function, but are given by a complex formula incorporating the surface condition of ultrafine particles. The temperature dependence of the spontaneous magnetization is different from the bulk and is explained by considering the existence of surface magnetism. The size distribution of colloidal particles is a log-normal type with a mean diameter of d̄=3.6 nm and with a standard deviation of σ=1.28 (from an electron micrograph).
ISSN:0021-4922
1347-4065
DOI:10.1143/jjap.26.713