The modes of skyrmionium motion induced by vacancy defects on a racetrack

Kong, Lingwen; Bo, Lan; Zhao, Rongzhi; Hu, Chenglong; Ji, Lü; Chen, Wenchao; Li, Yixing; Zhang, Yanhui; Zhang, Xuefeng

doi:10.1016/j.jmmm.2021.168173

Cited by 6 publications

(5 citation statements)

References 38 publications

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“…Li et al [136] attributed this phenomenon to the fact that the total skyrmion number of two skyrmions with opposite polarity inside and outside cancel each other out to zero, and they proved this point through force analysis, as shown in figure 10(a). Taking into account the inevitable device defects in practical applications, Kong et al [137] further explored the impact of defects on the motion of spin-wave driven skyrmionium. According to the size of the defect, they divided the motion into three modes: reflection, pinning, and de-pinning, as shown in figure 10(b).…”

Section: Spin-wave Driven Motionmentioning

confidence: 99%

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Micromagnetic manipulation and spin excitation of skyrmionic structures

Bo¹,

Hu²,

Zhao³

et al. 2022

J. Phys. D: Appl. Phys.

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Magnetic skyrmions have attracted enormous research interest across a wide range of fields, from condensed matter physics to material science, since the first observation in 2009. Abundant theoretical, computational, and experimental studies have contributed to this emerging interdiscipline: skyrmionics. Especially, great expectations have been placed on exploiting the physics and dynamics of magnetic skyrmions as potential information carriers. In this topical review, we particularly focus on the computational studies of skyrmions during the last decade. After briefly introducing the mechanism of micromagnetic simulations, we review and discuss the manipulation of skyrmions, i. e., their creation, transformation, motion, and spin excitation, by both traditional and advanced methods, including electric currents, magnetic fields, spin waves, microwaves, etc. We take magnetic skyrmion as a typical example, while other skyrmion-related magnetic structures such as skyrmioniums and skyrmion tubes are also slightly involved. Through this review, we hope to give some insights into the further development of magnetic skyrmions in spintronics.

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Section: Spin-wave Driven Motionmentioning

confidence: 99%

“…Right:illustration of the directions of the spin-wave currents, spin-wave driving forces, and velocities for skyrmionic structures[136]. (b) The amplitude distribution of spin waves for different modes of skyrmionium motion: reflection, pinning, and de-pinning, which can be distinguished according to the spin-wave amplitude[137].…”

mentioning

confidence: 99%

Micromagnetic manipulation and spin excitation of skyrmionic structures

Bo¹,

Hu²,

Zhao³

et al. 2022

J. Phys. D: Appl. Phys.

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“…Recently, it has been found that the pinning locations, such as geometric defects or restrictions that hinder the movement of skyrmions, significantly affect the mobility of skyrmions transported at the nanoscale [5,[21][22][23][24][25]. The influence of geometric structure is attributed to the repulsive force from the edges of racetracks and the flexibility of skyrmions to avoid being pinned by defects or restrictions [26,27]. Pinning effect refers to being pinned by interaction with the nanostructure.…”

Section: Introductionmentioning

confidence: 99%

“…The changes in the geometric structure of nanotracks cause energy changes in corresponding local regions, resulting in pinning forces that produce pinning effect on the motion of skyrmions [28,29]. The energy change in a local region can induce an energy barrier in the local region [27]. The energy barrier determines the local minimum of skyrmion potential energy in space.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric energy barrier induced magnetic skyrmion diodes in synthetic antiferromagnetic nanotracks

Xu,

Hu,

Zhang

et al. 2024

J. Phys. D: Appl. Phys.

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Magnetic skyrmions are nanoscale spin textures with topological protection properties, which are regarded as promising information carriers. When skyrmions move along nanotracks, their trajectories will shift if affected by skyrmion Hall effect and pinning effect. In this work, the influence of trapezoidal notches in synthetic antiferromagnetic nanotracks on the dynamics of skyrmions is investigated through micromagnetic simulation. The results exhibit that the asymmetric energy barrier induced by the asymmetric geometric structure can hinder reverse motion of skyrmions to realize the unidirectional conduction function of the diodes. Adjusting the height and inclination angle of the trapezoidal notch can effectively expand the current operating windows of the diodes, and the larger the height or inclination angle, the higher the threshold current density to overcome the pinning effect of the geometric energy barrier. Furthermore, the failure mode has a crucial impact on the implementation of skyrmion diodes. By utilizing the asymmetric structure, the forward conduction and reverse cutoff of skyrmion-based diodes can be achieved within 4 ns, with lower energy consumption than traditional diodes, resulting in high efficiency and low energy consumption of diodes. This work proposes a method for realizing the diode functionality by simply altering the geometric structure of the nanotracks, which may play an important role in the design and application of skyrmion-based diodes.

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“…Skyrmionium can be generated by spin-polarized current, magnetic field pulses, or strain mediation, 3,9 and can be driven by the current-in-plane (CIP), the current-perpendicular-to-plane (CPP), spin wave, or gradient of uniaxial perpendicular anisotropy in a non-centrosymmetric system. 7,10–17 Because of these advantages skyrmionium has been widely researched in spintronics, e.g. track memory, oscillators, memristors, and artificial synaptic devices.…”

Section: Introductionmentioning

confidence: 99%