Spin torque nano-oscillators based on isolated edge skyrmions in nano-pillars with perpendicular anisotropy

Lv, Gang; Hong, Zhang; Zhou, Jia; Gao, Feng; Liu, Guihua; Sun, Fenglan; Zhou, Shihong; Zheng, Cuixiu; Liu, Yaowen; Hou, Zhipeng; Zhang, Chao

doi:10.1016/j.physleta.2021.127448

Cited by 3 publications

(3 citation statements)

References 37 publications

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“…However, for a ferromagnetic skyrmion-based STO, the oscillation frequency usually is only a few GHz. We have reported the frequency changing range of an isolated edge skyrmion-based STO can be generated from 1 to 6.7 GHz [24]. Recent research results…”

Section: Introductionmentioning

confidence: 89%

“…Previous experimental studies have shown that magnetic skyrmions can be observed in systems with bulk or interfacial DMI [14][15][16][17]. The magnetic skyrmions can be used to generate periodic magnetic oscillation signals which show promise in spin-torque oscillators (STOs) [18][19][20][21][22][23][24]. The STOs hold potential applications for nextgeneration microwave signal generators [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43], in which the oscillating elements could use different topologically nontrivial spin textures.…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Spin-Torque Oscillator Based on Magnetic Domain and Meron

Zhang

Cao

et al. 2022

Front. Phys.

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“…For the motion of the skyrmion on edge, v x = 0., F by = 0 and F ey ≈ 0. The expression of skyrmion velocity v y can be obtained as [36]:…”

Section: Calculation Detailsmentioning

confidence: 99%

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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A spin-torque nano-oscillator based on interlayer-coupled meron–skyrmion pairs with a fixed orbit

Yi,

Han,

Jiang

et al. 2024

Journal of Applied Physics

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In recent years, magnetic skyrmion-based spin-torque nano-oscillators (STNOs) have attracted considerable interest for their prospect in future-generation communication and spintronic technologies. However, some critical issues, which hamper their practical applications, e.g., the long start-up time and variable skyrmion gyration orbit, remain to be resolved. Here, we numerically demonstrate the realization of a fixed-orbit STNO, which is based on an interlayer-coupled meron–skyrmion (MS) pair instead of a magnetic skyrmion. In this STNO, the MS pair possesses a structurally defined, fixed orbit within a broad range of driving currents, even in the presence of random defects. The output frequency range of the STNO based on an MS pair far exceeds that of the STNO typically featuring a single skyrmion. Moreover, the output frequency of this STNO can be further elevated if more MS pairs are incorporated. Our results reveal the nontrivial dynamics of the interlayer-coupled MS pair, opening perspectives for the design and optimization of fundamental spintronic devices.

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Spin torque nano-oscillators based on isolated edge skyrmions in nano-pillars with perpendicular anisotropy

Cited by 3 publications

References 37 publications

Spin-Torque Oscillator Based on Magnetic Domain and Meron

Spin-Torque Oscillator Based on Magnetic Domain and Meron

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

A spin-torque nano-oscillator based on interlayer-coupled meron–skyrmion pairs with a fixed orbit

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