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Lee, Ki-Suk
Creative Lab. for Advanced Spin Systems (CLASS)
Research Interests
  • Magnetism, spintronics, spin dynamics, rare-earth free magnet

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Electric-current-driven vortex-core reversal in soft magnetic nanodots

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Title
Electric-current-driven vortex-core reversal in soft magnetic nanodots
Author
Kim, Sang-KoogChoi, Youn-SeokLee, Ki-SukGuslienko, Konstantin Y.Jeong, Dae-Eun
Keywords
SPIN-WAVES; EXCITATION; DYNAMICS; DOT
Issue Date
2007-08
Publisher
AMER INST PHYSICS
Citation
APPLIED PHYSICS LETTERS, v.91, no.8, pp.1 - 3
Abstract
The authors report on electric-current-driven vortex-core (VC) reversal (switching) and the accompanying spin-wave emission, driven by spin-polarized ac currents of different amplitudes and frequencies, investigated by micromagnetic calculations of the dynamic evolution of a magnetic vortex in Permalloy nanodots. The magnetization orientation of the VC is effectively switchable between its upward and downward bistates and controllable by applying current above its threshold density, but with sufficiently small magnitude at frequencies close to the vortex eigenfrequency. This VC reversal phenomenon occurs through the creation of a vortex-antivortex pair and the subsequent annihilation of the initial vortex and the created antivortex, when the velocity of the initial VC reaches its critical value of approximately 340 +/- 20 m/s for the given material and geometry. In the course of these serial processes and immediately after VC switching, strong spin waves are emitted. These results provide physical insights into how and when current-driven VC switching takes place, thereby offering a means to manipulate bistate VC orientations.
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DOI
10.1063/1.2773748
ISSN
0003-6951
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