Condensed Matter Physics Seminar
2 p.m., Thursday, December 1, 2005
Room 1201, Physics Building
Shaking ferromagnets with electric fields: instabilities, dissipation, and
noise
Yaroslav Tserkovnyak
(Harvard University)
Abstract: Spin dynamics accompanying electric currents in
nonuniform ferromagnets give rise to spin torques acting on the magnetization,
which can profoundly affect ferromagnetic dynamics. Large enough currents can
lead to magnetic instabilities and even chaotic behavior. I will derive
self-consistent equations of motion for the magnetization in the presence of
electric currents and discuss their implications for domain-wall dynamics and
spin-wave instabilities. The physical meaning of the results can be understood
by considering spin currents in magnetic superlattices.
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Host: Yakovenko
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