https://doi.org/10.1140/epjb/e2011-20299-2
Regular Article
Nonautonomous helical motion of magnetization in ferromagnetic nanowire driven by spin-polarized current and magnetic field
1
Department of Applied Physics, Hebei University of
Technology, Tianjin
300401, P.R.
China
2
School of Information Engineering, Hebei University of
Technology, Tianjin,
300401, P.R.
China
3
College of Physics and Microelectronics Science, Key Laboratory
for Micro-Nano Physics and Technology of Hunan Province, Hunan
University, Changsha
410082, P.R.
China
4
Beijing National Laboratory for Condensed Matter Physics,
Institute of Physics, Chinese Academy of Sciences, Beijing
100080, P.R.
China
a e-mail: zdli2003@yahoo.com
Received:
19
April
2011
Received in final form:
21
September
2011
Published online:
10
November
2011
We report the nonautonomous domain wall motion in ferromagnetic nanowire driven by spin-polarized current and magnetic field. Our results expatiate the major formation of domain wall velocity which comes from two parts: the longitudinal external field along the easy axis and the coherent domain wall rotation velocity. A critical condition is obtained analytically. Below the critical value, the domain wall rotation stops finally and domain wall velocity is proportional to the longitudinal external field. Above the critical value, the domain wall open out the novel nonautonomous helical motion characterized by the coherent rotation without any distortion. The domain wall velocity can be arbitrarily large for the linear proportion to longitudinal field strength.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2011
