Twisted skyrmions at domain boundaries and the method of image skyrmions

Yang, Huanhuan; Wang, C.; Wang, Xiaofan; Wang, X. S.; Cao, Yunshan; Peng, Yan

doi:10.1103/physrevb.98.014433

Cited by 21 publications

(17 citation statements)

References 58 publications

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“…2(e)]. The high speed of the AFM skyrmion agrees with the formula v = (β/α)ux obtained from the Thiele's equation [45,46], as shown in the inset of Fig. 2(f), where u = µ B j e /[|e|M s (1 + β 2 )] is the drift velocity of conduction electrons with µ B the Bohr magneton, e the electron charge, and β the material nonadiabatic parameter (we set β = 0.1 in the simulations).…”

Section: Arxiv:180701048v2 [Cond-matmes-hall] 17 Oct 2018supporting

confidence: 83%

Antiferromagnetism Emerging in a Ferromagnet with Gain

Yang

Wang

et al. 2018

Phys. Rev. Lett.

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We present a theoretical mapping to show that a ferromagnet with gain (loss) is equivalent to an antiferromagnet with an equal amount of loss (gain). Our finding indicates a novel first-order ferromagnet-antiferromagnet phase transition by tuning the gain-loss parameter. As an appealing application, we demonstrate the realization as well as the manipulation of the antiferromagnetic skyrmion, a stable topological quasiparticle not yet observed experimentally, in a chiral ferromagnetic thin film with gain. We also consider ferromagnetic bilayers with balanced gain and loss, and show that the antiferromagnetic skyrmion can be found only in the cases with broken parity-time symmetry phase. Our results pave a way for investigating the emerging antiferromagnetic spintronics and parity-time symmetric magnonics in ferromagnets.

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Section: Arxiv:180701048v2 [Cond-matmes-hall] 17 Oct 2018supporting

confidence: 83%

Antiferromagnetism Emerging in a Ferromagnet with Gain

Yang

Wang

et al. 2018

Phys. Rev. Lett.

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“…The DMI is one of the most important parameters to form skyrmions in the magnetic systems and indispensable for a nanoscale skyrmion [27]. In addition, the modulation of DMI is also one of the methods [28][29][30] to prevent the skyrmion Hall effect. We usually define the helicity of skyrmion by the phase χ [20] appearing in φ(ϕ) = N sk ϕ + χ, where the N sk is defined as the skyrmion number.…”

Section: Resultsmentioning

confidence: 99%

Spin current pumped by confined breathing skyrmion

Zhang¹,

Jin²,

Xia³

et al. 2020

New J. Phys.

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Spin pumping is a widely recognized method to generate the spin current in the spintronics, which can be found in varieties of magnetic materials and is acknowledged as a fundamentally dynamic process equivalent to the spin-transfer torque. In this work, we theoretically verified the oscillating spin current mixed by AC and DC components can be pumped from the microwave-motivated breathing skyrmion. The spin current can be pumped within a relatively low-frequency microwave compared with the in-plane ferromagnetic resonance (FMR). Although the amplitude of spin current density for a single confined skyrmion is several times lower than the FMR spin pumping, the pumped current would be improved to be the same order as the FMR through a tight skyrmion lattice. Based on the spin pumping of breathing skyrmion, we designed a high reading-speed racetrack memory model whose reading speed is much higher than the SOT (spin-orbit torque)/STT (spin-transfer torque) skyrmion racetrack. Our work focuses on the spin pumping phenomenon inside the breathing skyrmion, and it may contribute to the applications of the skyrmion-based device.

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“…Recently, the DMI has drawn extensive research interest due to two main reasons. One is the fundamental role it plays in stabilizing magnetic skyrmions [28][29][30][31][32] and chiral domain walls [33,34]. The other one is the DMI induced exotic spin-wave phenomena, such as nonreciprocal propagation of spin waves [35][36][37], nonlinear three-magnon processes [38], and magnonic Goos-Hänchen effect [39].…”

Section: Introductionmentioning

confidence: 99%

Effect of Dzyaloshinskii-Moriya interaction on magnetic vortex switching driven by radial spin waves

Wang,

Cao,

Wang

et al. 2020

Preprint

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We theoretically investigate the radial-spin-wave induced magnetic vortex switching in the presence of Dzyaloshinskii-Moriya interaction (DMI). From micromagnetic simulations, we observe a circular-to-radial vortex phase transition by increasing the DMI strength. The radial spin-wave excitation spectrum for each magnetization configuration is analyzed, showing that the frequency of spin-wave mode with a given radial node number monotonically increases (decreases) with the DMI parameter of the radial (circular) vortex. Interestingly, we find that the DMI can significantly facilitate the polarity switching of the circular vortex driven by radial spin waves. Our work provides a new insight into the DMI effect on the vortex dynamics and is helpful for designing fast all-magnonic memory devices.

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Twisted skyrmions at domain boundaries and the method of image skyrmions

Cited by 21 publications

References 58 publications

Antiferromagnetism Emerging in a Ferromagnet with Gain

Antiferromagnetism Emerging in a Ferromagnet with Gain

Spin current pumped by confined breathing skyrmion

Effect of Dzyaloshinskii-Moriya interaction on magnetic vortex switching driven by radial spin waves

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