期刊
NATURE NANOTECHNOLOGY
卷 6, 期 10, 页码 635-638出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NNANO.2011.140
关键词
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资金
- CNISM
- European Community [FP7/2007-2013, 228673]
- Swedish Foundation for Strategic Research (SSF)
- Swedish Research Council (VR)
- Knut and Alice Wallenberg Foundation
- C.M. Lerici foundation
Spin torque oscillators with nanoscale electrical contacts(1-4) are able to produce coherent spin waves in extended magnetic films, and offer an attractive combination of electrical and magnetic field control, broadband operation(5,6), fast spin-wave frequency modulation(7-9), and the possibility of synchronizing multiple spin-wave injection sites(10,11). However, many potential applications rely on propagating (as opposed to localized) spin waves, and direct evidence for propagation has been lacking. Here, we directly observe a propagating spin wave launched from a spin torque oscillator with a nanoscale electrical contact into an extended Permalloy (nickel iron) film through the spin transfer torque effect. The data, obtained by wave-vector-resolved micro-focused Brillouin light scattering, show that spin waves with tunable frequencies can propagate for several micrometres. Micromagnetic simulations provide the theoretical support to quantitatively reproduce the results.
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