Chemical synthesis is a versatile technique for fabricating novel nanostructured materials. In the Rieke process, a metal salt is reduced by an alkali in a hydrocarbon solvent to form small, highly reactive particles. Synthesis at an elevated temperature (200'C) increases the as-synthesized particle size and produces higher coercivities and remanence ratios than observed in similar syntheses at...

The effect of Ca-substitution on the physical and magnetic properties of Li0.3-0.5xZn0.4CaxFe2.3-0.5xO4 ferrites (x = 0.0, 0.01, 0.02, 0.03, and 0.05), prepared by the standard ceramic method, has been studied. It is found that the saturation magnetization increases up to x = 0.01 and then it decreases. On the other hand, the initial permeability decreased while the Curie temperature remained a...

Ferrofluid instabilities in DC magnetic fields for an Isopar-M based ferrofluid with saturation magnetization of about 400 Gauss. a) 1200 Gauss 5 mm diameter magnet behind small ferrofluid droplet surrounded by propanol to prevent ferrofluid wetting of 1 mm gap glass plates; Peak pattern with magnetic field perpendicular to ferrofluid layer. The peaks initiate in a hexagonal array when the magn...

METEORITES: INSIGHTS FROM MAGNETIC REMANENCE AND FIRST-ORDER REVERSAL CURVE (FORC) MEASUREMENTS. G. Acton 1 , Q.-Z. Yin 1 , K. L. Verosub 1 , and D. S. Ebel 2 , 1 Dept. of Geology, University of California, Davis, One Shields Avenue, Davis, CA 95616 (E-mail: [email protected], [email protected], [email protected]). 2 Department of Earth and Planetary Sciences, American M...

A computer simulation model for estimation of the interaction fields in fine particle systems has been developed. The method uses the experimental Ma(H) plot, constructed from the Fourier description of the initial magnetization curve and the hysteresis loop, and the M(H) plot, obtained from the remanence curves. The dependencies of the interaction fields on the external magnetic field have bee...