85 research outputs found
Comment on ``Magnon wave forms in the presence of a soliton in two--dimensional antiferromagnets with a staggered field''
Very recently Fonseca and Pires [Phys. Rev. B 73, 012403(2006)] have studied
the soliton--magnon scattering for the isotropic antiferromagnet and calculated
``exact'' phase shifts, which were compared with the ones obtained by the Born
approximation. In this Comment we correct both the soliton and magnon solutions
and point out the way how to study correctly the scattering problem.Comment: 2 pages (RevTeX
Controllable switching of vortex chirality in magnetic nanodisks by a field pulse
We propose a way of fast switching the chirality in a magnetic nanodisk by
applying a field pulse. To break the symmetry with respect to clockwise or
counterclockwise chirality a mask is added by which an inhomogeneous field
influences the vortex state of a nanodisk. Using numerical spin--lattice
simulations we demonstrate that chirality can be controllably switched by a
field pulse, whose intensity is above some critical value. A mathematical
definition for the chirality of an arbitrary shaped particle is proposed.Comment: REVTeX, 4 pages, 3 figure
Switching of the vortex polarity in a magnetic nanodisk by a DC current
We study the dynamics of a vortex state nanodisk due to a dc spin current,
perpendicular to the disk plane. The irreversible switching of the vortex
polarity takes place above some threshold current. The detailed description of
these processes is obtained by spin-lattice simulations.Comment: REVTeX, 4 pages, 3 figure
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