Friday, March 30, 2007
4:00 PM
Physics Building, Room 204
Note special time.

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"Topological defects in nanomagnets"

Oleg Tchernyshyov , Johns Hopkins
[Host: Paul Fendley]
The interplay of local and long-range forces in ferromagnets leads to the formation of mesoscopic domains with sharp boundaries (domain walls). The physics changes drastically when the magnet size becomes smaller than the width of a domain wall. In submicron magnets the magnetization forms intricate smooth patterns that involve the more exotic topological defects: integer and fractional vortices, skyrmions, merons, and magnetic monopoles. I will describe recent experiments with these entities and our attempts to describe their static and dynamic properties.

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