Dynamics of a domain wall and spin-wave excitations driven by a mesoscopic current

Details Dynamics of a domain wall and spin-wave excitations driven by a mesoscopic current Dynamics of a domain wall and spin-wave excitations driven by a mesoscopic current

2005-03-10

arxiv.org/abs/cond-mat/0503247v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.96.027204

The dynamics of a domain wall driven by a spin-polarized current in a mesoscopic system is studied numerically. Spin-mixing in the states of the conduction electrons is fully taken into account. When the Fermi energy of the electrons is larger than the exchange energy ($E_{\rm F}>J_{\rm sd}$), the spin precession induces spin wave excitations in the local spins which contribute towards the displacement of the domain wall. The resulting average velocity is found to be much smaller than the one obtained in the adiabatic limit. For $E_{\rm F}

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