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Probing vortex-core dynamics using current-induced resonant excitation of a trapped domain wall

2008; Nature Portfolio; Volume: 4; Issue: 5 Linguagem: Inglês

10.1038/nphys936

1745-2481

Rai Moriya, Luc Thomas, Masamitsu Hayashi, Ya. B. Bazaliy, Charles Rettner, S. Parkin,

Quantum and electron transport phenomena

A magnetic vortex trapped by a notch in a nanowire is no larger than 10 nm, but both the direction and polarity of the vortex can now be measured without applying a magnetic field. In this set-up, the vortex is therefore both stable and switchable for use in possible device applications. Magnetic domain walls in soft magnetic nanowires often exhibit a structure in which the magnetization curls within the plane of the nanowire around a singular point with out-of-plane magnetization, the vortex core1,2. Although the core is a small object, with a diameter of only ∼10 nm in permalloy2, its motion controls the dynamics of the entire wall, which can be several hundred nanometres in size. In particular, when a domain wall trapped at a pinning site is driven out of equilibrium by either a magnetic field or a spin-polarized current, the vortex core gyrates around its equilibrium position. The sense of gyration is determined by the polarity of the core3,4,5,6,7. Here, we show that spin-polarized a.c. currents can resonantly excite a vortex domain wall trapped at a notched site in a nanowire. The shape and magnitude of the resonance, measured from the nanowire's resistance, reveal both the elliptical trajectory of the vortex core as well as its polarity.