Strong Skyrmion Oscillations Driven by Spatially Dependent Spin Current

Xing, Renhao; Kou, Yuanshi; Wang, Yasai; Zhou, Jiayang; Wei, Y. J.; You, Long; Xiong, Rui; Zeng, Zhongming; Liang, Shiheng; Yang, Xiaofei; Zhang, Zhendong; Zhang, Yue

doi:10.1103/physrevapplied.13.054055

Cited by 4 publications

(6 citation statements)

References 36 publications

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“…In the above simulation results, the diameter d of the central region remains unchanged. However, the previous results show that the amplitude and period of the skyrmion oscillation can be well manipulated by modifying the dimension of the medium [56]. Using the parameters in Figure 2, we study the influence of the diameter d of the central circular region on the oscillation mode.…”

Section: Resultsmentioning

confidence: 99%

Spin-Torque Oscillator Based on Magnetic Domain and Meron

Zhang

Cao

et al. 2022

Front. Phys.

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In this work, micromagnetic simulations demonstrate that a steady oscillation mode accompanied by magnetic domain splitting and the creation and annihilation of meron can be excited by spin-polarized currents. It is found that the in-plane magnetic anisotropy and Dzyaloshinskii-Moriya interaction (DMI) have a greater influence on the oscillation frequency. The oscillation frequency can vary from 3 GHz to 31 GHz by controlling anisotropy strength under a fixed current density. By changing DMI strength, the oscillation frequency varies from 9 to 13.6 GHz and from 29.7 to 37 GHz. Compared with ferromagnetic skyrmion-based spin-torque oscillators (STOs), the STOs based on this magnetic domain and meron further increase the oscillation frequency. Our results may provide theoretical support for the research and development of future high-frequency STOs.

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Section: Resultsmentioning

confidence: 99%

Spin-Torque Oscillator Based on Magnetic Domain and Meron

Zhang

Cao

et al. 2022

Front. Phys.

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“…The frequency can reach a few GHz that is higher than most of other ferromagnetic skyrmion-based oscillators (around a few hundred MHz). The oscillation is also caused by the deformation of a skyrmion, but the driving current is spatially uniform, which is easily accessible compared to the method reported in other work 26 . Furthermore, both theoretical and experimental results have shown that a domain wall naturally acts as a magnonic waveguide, where spin waves can be excited easily and propagate with low dissipation [55][56][57][58] .…”

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confidence: 97%

“…The sustainable oscillation originates from the compensation between the current-induced spin transfer torques and the intrinsic damping, and therefore, the corresponding devices are called spin torque nano-oscillators (STNOs) 3,[7][8][9][10][11][12] . Such a nonlinear phenomenon focuses on the persistent precession of uniform magnetization 3,6,12,13 and later extends to the magnetic vortex [14][15][16][17][18][19] , domain walls [20][21][22] , skyrmions [23][24][25][26][27][28][29][30][31] , etc. Meanwhile, the dynamics of magnetic oscillation produces spin wave, which is also known as magnon in the quantum context and carries spin angular momentum 32,33 .…”

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confidence: 99%

“…Due to their unique static properties and rich dynamics, they are widely considered to be the information carriers for future ultrahigh-density, energy-efficient spintronics devices [46][47][48][49][50][51][52] . Among them, skyrmion-based STNO is one of the most important applications, and several schemes have been proposed to demonstrate the high frequency microwave generation [23][24][25][26][27][28][29][30] . To date, there are three main mechanisms: (1) the gyrotropic motion of skyrmions in a nanodisk induced by spin torques and the repulsive force from the boundary [23][24][25]30 ;…”

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confidence: 99%

“…(2) the breathing mode of skyrmions characterized by periodic changes in size 27,28,53,54 ; (3) the periodic deformation of a skyrmion driven by a spatial-dependent spin current 26 .…”

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Elongated skyrmion as spin torque nano-oscillator and magnonic waveguide

et al. 2022

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Spin torque nano-oscillator has been extensively studied both theoretically and experimentally in recent decades due to its potential applications in future microwave communication technology and neuromorphic computing. In this work, we present a skyrmion-based spin torque nano-oscillator driven by a spatially uniform direct current, where an elongated skyrmion is confined by two pinning sites. Different from other skyrmion-based oscillators that arise from the circular motion or the breathing mode of a skyrmion, the steady-state oscillatory motion is produced by the periodic deformation of the elongated skyrmion, which originates from the oscillation of its partial domain walls under the joint action of spin torques, the damping and the boundary effect. Micromagnetic simulations are performed to demonstrate the dependence of the oscillation frequency on the driving current, the damping constant, the magnetic parameters as well as the characteristics of pinning sites. This nonlinear response to a direct current turns out to be universal and can also appear in the case of elongated antiskyrmions, skyrmioniums and domain walls. Furthermore, the elongated skyrmion possesses a rectangle-like domain wall, which could also serve as a magnonic waveguide. These findings will enrich the design options for future skyrmion-based devices in the information technology.

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Dynamics of magnetic system formed by two semi-skyrmions in circular nano-pillars with a perpendicular anisotropy

Zhang¹,

Hou²,

Zhang³

et al. 2022

J. Phys. D: Appl. Phys.

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Magnetic skyrmion has the advantages of stable topology and small volume. Many researchers choose different materials or build double-free layers to achieve their goals to apply it to spin-torque nano-oscillator that can output high frequency. In this paper, the dynamics of the two semi-skyrmions in circular nano-pillar oscillators with perpendicular magnetic anisotropy (PMA) free layer and spin polarizer are studied through micromagnetic simulation. the oscillation frequency of two semi-skyrmions is much higher than that of the single-semi-skyrmion, which is more than twice that of the single-semi-skyrmion. In addition, we also explore the influences of different parameters (current density, damping coefficient, anisotropy constant, and temperature) on the motion of two semi-skyrmions motion. The results shown in the damping coefficient and the exchange constant have great influences on the oscillation frequency.

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Strong Skyrmion Oscillations Driven by Spatially Dependent Spin Current

Cited by 4 publications

References 36 publications

Spin-Torque Oscillator Based on Magnetic Domain and Meron

Spin-Torque Oscillator Based on Magnetic Domain and Meron

Elongated skyrmion as spin torque nano-oscillator and magnonic waveguide

Dynamics of magnetic system formed by two semi-skyrmions in circular nano-pillars with a perpendicular anisotropy

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