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

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.
Authors:
; ;
Publication Date:
OSTI Identifier:
1176524
Report Number(s):
8,558,333
13/383,059
DOE Contract Number:
FG02-99ER45789
Resource Type:
Patent
Resource Relation:
Patent File Date: 2010 Jul 09
Research Org:
The University of Chicago, Chicago, IL (United States) ; UCL Business PLC, London (Great Britain)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY