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SYSTEM AND METHOD FOR MANIPULATING DOMAIN PINNING AND REVERSAL IN FERROMAGNETIC MATERIALS

United States Patent Application

20140036388
A1
View the Complete Application at the US Patent & Trademark Office
A method for manipulating domain pinning and reversal in a ferromagnetic material comprises applying an external magnetic field to a uniaxial ferromagnetic material comprising a plurality of magnetic domains, where each domain has an easy axis oriented along a predetermined direction. The external magnetic field is applied transverse to the predetermined direction and at a predetermined temperature. The strength of the magnetic field is varied at the predetermined temperature, thereby isothermally regulating pinning of the domains. A magnetic storage device for controlling domain dynamics includes a magnetic hard disk comprising a uniaxial ferromagnetic material, a magnetic recording head including a first magnet, and a second magnet. The ferromagnetic material includes a plurality of magnetic domains each having an easy axis oriented along a predetermined direction. The second magnet is positioned adjacent to the magnetic hard disk and is configured to apply a magnetic field transverse to the predetermined direction.
Silevitch, Daniel M. (Chicago, IL), Rosenbaum, Thomas F. (Wilmette, IL), Aeppli, Gabriel (Hanover, NH)
14/ 053,100
October 14, 2013
FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0002] This invention was made with U.S. government support under grant number DEFG02-99ER45789 from the Department of Energy (DOE) Basic Energy Sciences. The U.S. government may have certain rights in this invention.