Article

Micromagnetic Modeling of Nanocontact Spin-Torque Oscillators With Perpendicular Anisotropy at Zero Bias Field

Dipt. di Fis. della Materia e Ing. Elettron., Univ. of Messina, Messina
IEEE Transactions on Magnetics (impact factor: 1.36). 12/2008; DOI:10.1109/TMAG.2008.2002596 pp.2512 - 2515
Source: IEEE Xplore

ABSTRACT In this paper, we present a numerical study to determine the feasibility of exciting and sustaining stable magnetization oscillations in magnetic nanocontact devices subjected to the combined action of a spin-polarized current and a perpendicular anisotropy field when no external field is applied. A systematic numerical analysis of the properties exhibited by such spintronic oscillators is carried out by means of a micromagnetic framework. The study reveals a nonlinear behavior of the excited frequency as the anisotropy field strength is varied. More noteworthy, full-scale investigations result in a hysteretic dependence of the excited frequency on the applied current together with the existence of two kinds of precessional spin-wave modes: an anisotropic radially propagating mode and a gyrotropic motion of a magnetic vortex-core.

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Keywords

anisotropic radially propagating mode
 
anisotropy field strength
 
combined action
 
excited frequency
 
feasibility
 
gyrotropic motion
 
hysteretic dependence
 
magnetic vortex-core
 
perpendicular anisotropy field
 
precessional spin-wave modes
 
properties exhibited
 
spintronic oscillators
 
stable magnetization oscillations
 
systematic numerical analysis