Images of a Spin-Torque-Driven Magnetic Nano-Oscillator

Title
Images of a Spin-Torque-Driven Magnetic Nano-Oscillator
Authors
이억재XW YuVS PribiagY AcremannAA TulapurkarT TyliszczakKW ChouB BrauerZ-P LiPG GowthamDC RalphRA BuhrmanJ Stohr
Issue Date
2011-04
Publisher
Physical review letters
Citation
VOL 106, NO 16, 167202
Abstract
We present the first space- and time-resolved images of the spin-torque-induced steady-state oscillation of a magnetic vortex in a spin-valve nanostructure. We find that the vortex structure in a nanopillar is considerably more complicated than the 2D idealized structure often-assumed, which has important implications for the driving efficiency. The sense of the vortex gyration is uniquely determined by the vortex core polarity, confirming that the spin-torque acts as a source of negative damping even in such a strongly nonuniform magnetic system. The orbit radius is similar to 10 nm, in agreement with micromagnetic simulations.
URI
http://pubs.kist.re.kr/handle/201004/65308
ISSN
0031-9007
Appears in Collections:
KIST Publication > Article
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