System and method for manipulating domain pinning and reversal in ferromagnetic materials

Silevitch, Daniel M.; Rosenbaum, Thomas F.; Aeppli, Gabriel

Title: System and method for manipulating domain pinning and reversal in ferromagnetic materials

Patent · Tue Oct 15 00:00:00 EDT 2013

OSTI ID:1176524

Silevitch, Daniel M.; Rosenbaum, Thomas F.; Aeppli, Gabriel

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.

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Research Organization:: The University of Chicago, Chicago, IL (United States); UCL Business PLC, London (Great Britain)

Sponsoring Organization:: USDOE

DOE Contract Number:: FG02-99ER45789

Assignee:: The University of Chicago (Chicago, IL) ; UCL Business PLC (London, GB)

Patent Number(s):: 8,558,333

Application Number:: 13/383,059

OSTI ID:: 1176524

Resource Relation:: Patent File Date: 2010 Jul 09

Country of Publication:: United States

Language:: English

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