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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1048
DTSTART:20080229T192000Z
DURATION:PT1H0M0S
DTSTAMP:20260409T030733Z
LAST-MODIFIED:19700101T060000Z
LOCATION:2241 Chamberlin Hall (coffee at 1:00)
SUMMARY:Topological defects in nanomagnets\, Physics Department Colloq
 uium\, Oleg Tchernyshyov\, Johns Hopkins University
DESCRIPTION:Formation of magnetic domains in a macroscopic ferromagnet
  is a familiar phenomenon caused by a competition between local and lo
 ng-range forces. The physics of domains becomes drastically different 
 in nanosized magnets. In particular\, domain walls in magnetic nanowir
 es are composite objects containing a few elementary topological defec
 ts: vortices with integer and fractional winding numbers. Dynamics of 
 such domain walls can be reduced to the motion of these "elementary pa
 rticles". A nonzero skyrmion charge of a vortex strongly influences th
 e dynamics of composite domain walls.
URL:https://www.physics.wisc.edu/events/?id=1048
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