The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 21, 2010
Filed:
Jan. 23, 2007
James Lupton Hedrick, Pleasanton, CA (US);
Delia Jane Milliron, Menlo Park, CA (US);
Alshakim Nelson, Fremont, CA (US);
Russell Clayton Pratt, Los Gatos, CA (US);
James Lupton Hedrick, Pleasanton, CA (US);
Delia Jane Milliron, Menlo Park, CA (US);
Alshakim Nelson, Fremont, CA (US);
Russell Clayton Pratt, Los Gatos, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method including providing Au-doped Co nanoparticles. The nanoparticles include a combination of non-ferromagnetic nanoparticles and weakly ferromagnetic nanoparticles. The nanoparticles each have an exterior surface. The surfaces of the nanoparticles are functionalized with 7-(5-uracil-ylcarbamoyl)heptanoic acid. A polymer is provided having a general formula including a uracil group. A dispersion is formed by agitating a solution of the nanoparticles. The solution is spin cast into a film. The film is heated under vacuum at a first temperature, T, resulting in inducing ferromagnetism in the non-ferromagnetic nanoparticles and converting the non-ferromagnetic nanoparticles to ferromagnetic nanoparticles, and resulting in enhancing ferromagnetism in the weakly ferromagnetic nanoparticles. The nanoparticles are aligned such that magnetic easy axes of the nanoparticles are oriented by applying a magnetic field to the dispersion while at a second temperature less than T. The axes align in a plane parallel to a plane of the film.