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

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.

Inventors:
; ;
Issue Date:
Research Org.:
The University of Chicago, Chicago, IL (United States); UCL Business PLC, London (Great Britain)
Sponsoring Org.:
USDOE
OSTI Identifier:
1176524
Patent Number(s):
8558333
Application Number:
13/383,059
Assignee:
The University of Chicago (Chicago, IL) ; UCL Business PLC (London, GB)
Patent Classifications (CPCs):
G - PHYSICS G11 - INFORMATION STORAGE G11C - STATIC STORES
DOE Contract Number:  
FG02-99ER45789
Resource Type:
Patent
Resource Relation:
Patent File Date: 2010 Jul 09
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Silevitch, Daniel M., Rosenbaum, Thomas F., and Aeppli, Gabriel. System and method for manipulating domain pinning and reversal in ferromagnetic materials. United States: N. p., 2013. Web.
Silevitch, Daniel M., Rosenbaum, Thomas F., & Aeppli, Gabriel. System and method for manipulating domain pinning and reversal in ferromagnetic materials. United States.
Silevitch, Daniel M., Rosenbaum, Thomas F., and Aeppli, Gabriel. Tue . "System and method for manipulating domain pinning and reversal in ferromagnetic materials". United States. https://www.osti.gov/servlets/purl/1176524.
@article{osti_1176524,
title = {System and method for manipulating domain pinning and reversal in ferromagnetic materials},
author = {Silevitch, Daniel M. and Rosenbaum, Thomas F. and Aeppli, Gabriel},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Oct 15 00:00:00 EDT 2013},
month = {Tue Oct 15 00:00:00 EDT 2013}
}

Works referenced in this record:

Critical behavior of uniaxial systems with strong dipolar interactions
journal, January 1976


Exact Relations among Amplitudes at Critical Points of Marginal Dimensionality
journal, November 1975


Quantum Critical Behavior for a Model Magnet
journal, July 1996


Critical behavior of a site-diluted three-dimensional Ising magnet
journal, June 1983


The random field Ising model
journal, November 1991


Induced Random Fields in the LiHo x Y 1 x F 4 Quantum Ising Magnet in a Transverse Magnetic Field
journal, December 2006


Entangled quantum state of magnetic dipoles
journal, September 2003


A homogenized energy framework for ferromagnetic hysteresis
journal, July 2006


Tunable quantum tunnelling of magnetic domain walls
journal, October 2001


Quantum and Classical Glass Transitions in LiHo x Y 1 x F 4
journal, July 2008


Logarithmic Corrections to the Landau Specific Heat near the Curie Temperature of the Dipolar Ising Ferromagnet LiTb F 4
journal, May 1975


Random field effects in disordered anisotropic antiferromagnets
journal, September 1979


A ferromagnet in a continuously tunable random field
journal, August 2007


Equilibrium Random-Field Ising Critical Scattering in the Antiferromagnet Fe 0.93 Zn 0.07 F 2
journal, January 1999


Switchable hardening of a ferromagnet at fixed temperature
journal, January 2010


From classical to quantum glass
journal, October 1991


Random-Field Effects in Two- and Three-Dimensional Ising Antiferromagnets
journal, February 1982


Critical behavior of the random-field Ising model
journal, March 1996


Nonanalytic Behavior Above the Critical Point in a Random Ising Ferromagnet
journal, July 1969


Coherent Spin Oscillations in a Disordered Magnet
journal, June 2002


Quantum Annealing of a Disordered Magnet
journal, April 1999


Theory of the magnetic phase diagram of Li Ho F 4
journal, October 2004


Random-field critical behavior of a d = 3 Ising system
journal, September 1983


Quantum Phase Transition of a Magnet in a Spin Bath
journal, April 2005


LiHo x Y 1 x F 4 as a random-field Ising ferromagnet
journal, January 2008