Vortex polarity switching by a spin-polarized current.
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.
Caputo
Jean-Guy
JG
Laboratoire de Mathématiques, INSA de Rouen, B.P. 8, 76131 Mont-Saint-Aignan cedex, France. caputo@insa-rouen.fr
Gaididei
Yuri
Y
Mertens
Franz G
FG
Sheka
Denis D
DD