US Patent:
20120162815, Jun 28, 2012
Inventors:
Daniel M. Silevitch - Chicago IL, US
Thomas F. Rosenbaum - Wilmette IL, US
Gabriel Aeppli - Hanover NH, US
International Classification:
G11B 33/14
G11C 11/14
US Classification:
360 9712, 365173, G9B 33035
Abstract:
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.