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Physics Department Colloquium
Topological defects in nanomagnets
Date: Friday, February 29th
Time: 1:20 pm
Place: 2241 Chamberlin Hall (coffee at 1:00)
Speaker: Oleg Tchernyshyov, Johns Hopkins University
Abstract: Formation of magnetic domains in a macroscopic ferromagnet is a familiar phenomenon caused by a competition between local and long-range forces. The physics of domains becomes drastically different in nanosized magnets. In particular, domain walls in magnetic nanowires are composite objects containing a few elementary topological defects: vortices with integer and fractional winding numbers. Dynamics of such domain walls can be reduced to the motion of these "elementary particles". A nonzero skyrmion charge of a vortex strongly influences the dynamics of composite domain walls.
Host: Chubukov
Poster: https://www.physics.wisc.edu/events/posters/2008/1048.pdf
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