We demonstrate that a current pulse of a non-uniform spin-polarized current density in a nanomagnet can drive, apart from magnetization reversal a static magnetic vortex. This vortex configuration can be achieved in low shape anisotropy spin valves of elliptical cross-sectional area. These non-uniform configurations exist also in presence of either ion mill damages below the nano-aperture or thermal effects at low temperature. We performed a numerical experiment of spin-torque driven ferromagnetic resonance in a magnetic vortex configuration, our results predict a frequency response with a few maxima and minima related to small oscillation of the vortex state around its equilibrium configuration.
|Autori interni:||CARPENTIERI, Mario|
|Titolo:||Magnetic vortex driven by non-uniform injection of spin-polarized current in nano-scale spin-valves|
|Rivista:||JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS|
|Data di pubblicazione:||2009|
|Digital Object Identifier (DOI):||10.1016/j.jmmm.2008.10.017|
|Appare nelle tipologie:||1.1 Articolo in rivista|