23 research outputs found
Metastable domain wall dynamics in magnetic nanowires
We study the formation and control of metastable states of pairs of domain
walls in cylindrical nanowires of small diameter where the transverse walls are
the lower energy state. We show that these pairs form bound states under
certain conditions, with a lifetime as long as 200ns, and are stabilized by the
influence of a spin polarized current. Their stability is analyzed with a model
based on the magnetostatic interaction and by 3D micromagnetic simulations. The
apparition of bound states could hinder the operation of devices.Comment: to be published EPJ
Spin-torque effect on spin wave modes in magnetic nanowires
The interaction between a spin polarized dc electrical current and spin wave
modes of a cylindrical nanowire is investigated in this report. We found that
close to the critical current, the uniform mode is suppressed, while the edge
mode starts to propagate into the sample. When the current exceeds the critical
value, this phenomenon is even more accentuated. The edge mode becomes the
uniform mode of the nanowire. The higher spin wave modes are slowly pushed away
by the current until the propagating mode remains.Comment: 11 pages, 6 gigure