Related dynamics of magnetic vortexes in five-layer spintransfer nanooscillator

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The influence of spin-polarized current and the number of magnetic layers on the coupled dynamics of vortices in small-diameter spin-transfer nanooscillators has been studied. Using the software package for micromagnetic modeling SpinPM, the dependence of the frequency on the current magnitude of the currents at which a stationary mode of coupled oscillations of three vortices is observed is found. For the case of three identical magnetic layers, the possibility of implementing different scenarios of coupled vortex dynamics is shown. It was found that numerical calculations for the case of three magnetic layers yield frequencies of stationary coupled oscillations that are lower than those predicted by theory. Built on effective equations for the coordinates of the vortex center.

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作者简介

E. Ekomasov

Ufa University of Science and Technology

Email: georgij.antonow@yandex.ru
俄罗斯联邦, st. Zaki Validi, 32, Ufa, 450076

D. Neradovsky

Tyumen State University

Email: georgij.antonow@yandex.ru
俄罗斯联邦, st. Volodarskogo, 6, Tyumen, 625003

G. Antonov

Ufa University of Science and Technology

编辑信件的主要联系方式.
Email: georgij.antonow@yandex.ru
俄罗斯联邦, st. Zaki Validi, 32, Ufa, 450076

V. Filippova

Ufa University of Science and Technology

Email: georgij.antonow@yandex.ru
俄罗斯联邦, st. Zaki Validi, 32, Ufa, 450076

参考

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2. Fig. 1. Schematic representation of a multilayer columnar nanostructure.

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3. Fig. 2. Trajectories of the vortex core motion in the upper layer, obtained for the 15/15/15 case at a current of 28.27 mA for the time intervals: 0…25 (a), 25…50 (b), 50…75 (c), 75…100 ns (d); the time moments are indicated: 0 (1), 25 (2), 50 (3), 75 (4) and 100 ns (5).

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4. Fig. 3. Trajectories of the vortex core motion in the middle layer, obtained for the case of 15/15/15 at a current of 28.27 mA for the time intervals: 0…25 (a), 25…50 (b), 50…75 (c), 75…100 ns (d); the time moments are indicated: 0 (1), 25 (2), 50 (3), 75 (4) and 100 ns (5).

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5. Fig. 4. Trajectories of the vortex core motion in the lower layer, obtained for the 15/15/15 case at a current of 28.27 mA for the time intervals: 0…25 (a), 25…50 (b), 50…75 (c), 75…100 ns (d); the time moments are indicated: 0 (1), 25 (2), 50 (3), 75 (4) and 100 ns (5).

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6. Fig. 5. Dependences of the frequency of stationary oscillations of vortices on the current value for a three-layer structure: three magnetic vortices move with the same frequency (1), two magnetic vortices move with the same frequency (2), the vortex escapes beyond the edge in the third magnetic layer (3); for a two-layer structure: the oscillation frequency for the first (4) and second (5) layers.

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