Authors:
Jean-Guy Caputo, Yuri Gaididei, Franz G. Mertens, Denis D. Sheka,
Publication:
Phys. Rev. Lett. 98, 056604 (2007), 10.1103/PhysRevLett.98.056604
Comments:
4 pages, 3 figures
arXiv:
http://arxiv.org/abs/cond-mat/0607362
The spin-transfer effect is investigated for the vortex state of a magnetic nanodot. A spin current is shown to act similarly to an effective magnetic field perpendicular to the nanodot. Then a vortex with magnetization (polarity) parallel to the current polarization is energetically favorable. Following a simple energy analysis and using direct spin-lattice simulations, we predict the polarity switching of a vortex. For magnetic storage devices, an electric current is more effective to switch the polarity of a vortex in a nanodot than the magnetic field.
Supplementary materials
Switching picture from numerical simulations on a square lattice with circular boundary.
Disk diamter | 200a |
Anisotropy coefficient | 0.03 a |
Damping coefficient | 0.01 |
Degree of spin polarization | 0.25 |
Spin current | -0.003 |