Magnetic skyrmion dynamics induced by surface acoustic waves

Yang, Yang; Ji, Yahui; Zhang, Chenye; Nan, Tianxiang

doi:10.1088/1361-6463/acb71f

Cited by 3 publications

(3 citation statements)

References 35 publications

(40 reference statements)

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“…The manipulation of skyrmion dynamics by acoustic wave could potentially lead to skyrmion-based memory, logic and microwave devices without involving electric currents and with designed motion trajectory (circular motion, Supplementary Fig. S13 ) 47 . For a simple comparison, the efficiency of different skyrmion-driven methods is provided in Supplementary Table.…”

Section: Discussionmentioning

confidence: 99%

Acoustic-driven magnetic skyrmion motion

Yang,

Zhao,

et al. 2024

Nat Commun

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Magnetic skyrmions have great potential for developing novel spintronic devices. The electrical manipulation of skyrmions has mainly relied on current-induced spin-orbit torques. Recently, it was suggested that the skyrmions could be more efficiently manipulated by surface acoustic waves (SAWs), an elastic wave that can couple with magnetic moment via the magnetoelastic effect. Here, by designing on-chip piezoelectric transducers that produce propagating SAW pulses, we experimentally demonstrate the directional motion of Néel-type skyrmions in Ta/CoFeB/MgO/Ta multilayers. We find that the shear horizontal wave effectively drives the motion of skyrmions, whereas the elastic wave with longitudinal and shear vertical displacements (Rayleigh wave) cannot produce the motion of skyrmions. A longitudinal motion along the SAW propagation direction and a transverse motion due to topological charge are simultaneously observed and further confirmed by our micromagnetic simulations. This work demonstrates that acoustic waves could be another promising approach for manipulating skyrmions, which could offer new opportunities for ultra-low power skyrmionics.

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Section: Discussionmentioning

confidence: 99%

Acoustic-driven magnetic skyrmion motion

Yang,

Zhao,

et al. 2024

Nat Commun

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“…Quantum coherence phenomena in semiconductors have also been the subject of extensive research. In particular, quantum structures such as quantum dots or wells have demonstrated the ability to control the band gap by altering their geometry [30][31][32][33][34]. This feature makes these structures highly customizable, serving as artificial atoms with potential applications in optoelectronics and quantum information technology.…”

Section: Introductionmentioning

confidence: 99%

Operating mode dependent energy transfer efficiency in a quantum well waveguide

Al-Dolaimy,

Kzar,

Jamil

et al. 2023

Laser Phys.

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In this paper, we delve into the intricate interplay between optical fields with varying relative phases in a closed-loop configuration semiconductor quantum well waveguide with four distinct energy levels, and how it impacts the Fraunhofer diffraction patterns obtained via four-wave mixing. By harnessing a strong control field, a standing wave driving field, and two weak probe and signal fields, we drive the waveguide to generate these patterns with maximum efficiency. To achieve this, we consider three distinct light-matter interaction scenarios, where the system is first set up in either a lower electromagnetically induced transparency or a coherent population trapping state, followed by a final state that enables electron spin coherence (ESC) induction. Our results reveal that the efficiency of Fraunhofer diffraction in the quantum well waveguide can be enhanced significantly under specific parameter regimes via the spin coherence effect. Further investigation of the light-matter interaction in the ESC zone, where only one of the control fields is a standing wave field, demonstrates that spin coherence facilitates more efficient transfer of energy from the probe light to the third and fourth orders, highlighting its crucial role in shaping the diffraction patterns.

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“…18 The dynamic strain induced by surface acoustic waves (SAWs) has also been suggested as an attractive approach to control thin film magnetization. [19][20][21][22][23][24][25][26][27][28][29][30][31] In particular, Yokouchi et al experimentally observed the creation of skyrmions by SAWs in a Pt/Co/Ir thin film owing to the inhomogeneous effective torque arising from both SAWs and thermal fluctuations via magnetoelastic coupling. 32 Nepal et al theoretically studied the dynamical pinning of skyrmion bubbles at the anti-nodes of standing SAWs in a FePt nano-wire, revealing the strain gradient induced by SAWs is the driving force for skyrmion motion.…”

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confidence: 99%

Transport of skyrmions by surface acoustic waves

Shuai,

Lopez-Diaz,

Cunningham

et al. 2024

Applied Physics Letters

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Magnetic skyrmions in thin films with perpendicular magnetic anisotropy are promising candidates for magnetic memory and logic devices, making the development of ways to transport skyrmions efficiently in a desired trajectory of significant interest. Here, we investigate the transport of skyrmions by surface acoustic waves (SAWs) via several modalities using micromagnetic simulations. We show skyrmion pinning sites created by standing SAWs at anti-nodes and skyrmion Hall-like motion without pinning driven by traveling SAWs. We also show how orthogonal SAWs formed by combining a longitudinal traveling SAW and a transverse standing SAW can be used for the 2D positioning of skyrmions. Our results also suggest SAWs offer a viable approach to the transport of multiple skyrmions along a multichannel racetrack.

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Magnetic skyrmion dynamics induced by surface acoustic waves

Cited by 3 publications

References 35 publications

Acoustic-driven magnetic skyrmion motion

Acoustic-driven magnetic skyrmion motion

Operating mode dependent energy transfer efficiency in a quantum well waveguide

Transport of skyrmions by surface acoustic waves

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