Spin-torque-induced rotational dynamics of a magnetic vortex dipole

Article

关键词: POINT-CONTACT DEVICES;    DOMAIN-WALL MOTION;    POLARIZED CURRENT;    TUNNEL-JUNCTIONS;    CO/CU/CO PILLARS;    DRIVEN;    EXCITATIONS;    MULTILAYER;    REVERSAL;    WAVES;   

DOI  :  10.1103/PhysRevB.78.174408

来源: SCIE

【 摘 要 】

We study, both experimentally and by numerical modeling, the magnetic dynamics that can be excited in a magnetic thin-film nanopillar device using the spin torque from a spatially localized current injected via a tens-of-nanometer-diameter aperture. The current-driven magnetic dynamics can produce large-amplitude microwave emission at zero magnetic field, with a frequency well below that of the uniform ferromagnetic resonance mode. Micromagnetic simulations indicate that the physical origin of this efficient microwave nano-oscillator is the nucleation and subsequent steady-state rotational dynamics of a magnetic vortex dipole driven by the localized spin torque. The results show that this implementation of a spintronic nano-oscillator is a promising candidate for microwave technology applications.

【 授权许可】

Free