Patent ID: 7854878
Filing Date: 2010-12-21
Classification: B22F,B82Y,C08G,C08J,C08K,G11B,H01F

Abstract:
1. A method for forming and aligning chemically mediated dispersion of magnetic nanoparticles in a polymer, comprising: providing Au-doped Co nanoparticles, said Au-doped Co nanoparticles comprising a combination of non-ferromagnetic Au-doped Co nanoparticles and weakly ferromagnetic Au-doped Co nanoparticles, said Au-doped Co nanoparticles each having an exterior surface; functionalizing said surfaces of Au-doped Co nanoparticles with 7-(5-uracil-ylcarbamoyl)heptanoic acid; providing a polymer wherein the chemical structure of said polymer has at least one functional group, said polymer having the general formula: wherein n is between about 8 and about 200, and where R is after said functionalizing, forming a dispersion of said Au-doped Co nanoparticles in said polymer by agitating a cyclohexanone solution of said Au-doped Co nanoparticles and said polymer; spin casting said solution into a film and allowing said cyclohexanone to evaporate; heating said film under vacuum at a first temperature, T after said heating, aligning said Au-doped Co nanoparticles such that magnetic easy axes of said Au-doped Co nanoparticles are oriented in substantially the same direction by applying a 10 kOe magnetic field to the dispersion while at a second temperature, T