The influence of the edge effect on the skyrmion generation in a magnetic nanotrack

Ran, Nian; Zhao, Guoping; Tang, Huadong; Shen, Laichuan; Peng, Lai; Xia, Jingbo; Zhang, Xichao; Zhou, Yan

doi:10.1063/1.4976726

Cited by 19 publications

(7 citation statements)

References 55 publications

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“…Edge repulsion force that acts only in the vicinity of the edge requires a wire with a sufficiently thin width to be effective in complementing F . BCF Enhancement of the edge repulsion force to prevent annihilation can be achieved by engineering the edges using additional magnetic material and VCMA [32,33,[53][54][55].…”

Section: Bilayer Coupling Forcementioning

confidence: 99%

Bilayer skyrmion dynamics on a magnetic anisotropy gradient

2019

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Magnetic skyrmion transport has been primarily based on the use of spin torques which require high current densities and face performance deterioration associated with Joule heating. In this work, we derive an analytical model for energy efficient skyrmion propagation in an antiferromagneticallycoupled bilayer structure using a magnetic anisotropy gradient. The interlayer skyrmion coupling provides a strong restoring force between the skyrmions, which not only prevents annihilation but also increases their forward velocity up to the order of km s -1 . For materials with low Gilbert damping parameter, the interlayer skyrmion coupling force can be amplified up to ten times, with a corresponding increase in velocity. Furthermore, the analytical model also provides insights into the dynamics of skyrmion pinning and relaxation of asymmetric skyrmion pairs in bilayer-coupled skyrmion systems.

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Section: Bilayer Coupling Forcementioning

confidence: 99%

Bilayer skyrmion dynamics on a magnetic anisotropy gradient

2019

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“…Magnetic skyrmion is then observed in B20 structure of MnSi single crystal material and stabilized by the Dzyaloshinskii-Moriya interaction (DMI) due to the broken of the inversion symmetry [2]. On account of some special features: stable small size [3][4][5], rigid shape [6,7], and the simplicity to be driven by ultra-low current density [8][9][10], magnetic skyrmion has now been widely studied. The generation and annihilation of skyrmion in ferromagnetic and antiferromagnetic materials is also a hot research topic [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Influence of magnetic structure on the performance of twisted skyrmion-based nano-oscillator

Yang

Wang

et al. 2023

J. Phys.: Condens. Matter

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The spin torque nano-oscillator (STNO), a nanosize microwave signal generator, have caught the attention of a number of researchers due to its obvious advantages. Recently a chiral bulk material with twisted skyrmion has been discovered in studies with different helicity degrees. In this work, we design a new STNO based on twisted skyrmion existing in free layers of magnetic tunnel junction (MTJ) structure. We first investigate the effect of the magnetic moment of fixed layer on the twisted skyrmion and frequency of STNO. Although the magnetic moment of fixed layer does not affect the state of the twisted skyrmion but affects the precession frequency of STNO. Later, the current, external magnetic field and DMI strength are changed to regulate the oscillation frequency of STNO. Our result may be favourable for the design of new twisted skyrmion-based spin torque nano-oscillator.

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“…Therefore, the skyrmions can be efficiently confined in the racetrack center and the SkHE is avoided. Another aspect hampering the use of magnetic skyrmions in racetrack memory applications, is their uncontrollable excitation realized at the edges of magnetic nanostrips and thin films 25 leading to error writing events.. This phenomenon is known as the edge effect.…”

Section: Introductionmentioning

confidence: 99%

Magnetic skyrmions in cylindrical ferromagnetic nanostructures with chiral interactions

Kechrakos,

Tzannetou,

Patsopoulos

2019

Preprint

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We study the geometrical conditions for stabilizing magnetic skyrmions in cylindrical nanostrips and nanotubes of ferromagnetic materials with Dzyaloshinskii-Moriya interactions. We obtain the ground state of the system implementing a simulation annealing technique for a classical spin Hamiltonian with competing isotropic exchange and chiral interactions, radial anisotropy and an external field. We address the impact of surface curvature on the formation, the shape and the size of magnetic skyrmions. We demonstrate that the evolution of the skyrmion phase with the curvature of the nanoshell is controlled by the competition between two characteristic lengths, namely the curvature radius, R (geometrical length) and the skyrmion radius, R Sk (physical length). In narrow nanotubes (R < R Sk ) the skyrmion phase evolves to a stripe phase, while in wide nanotubes (R > R Sk ) a mixed skyrmion-stripe phase emerges. Most interestingly, the mixed phase is characterized by spatially separated skyrmions from stripes owing to the direction of the applied field relative to the surface normal. Below the instability region (R R Sk ) skyrmions remain circular and preserve their size as a consequence of their topological protection. Zero-field skyrmions are shown to be stable on curved nanoelements with free boundaries within the same stability region (R R Sk ). The experimental and technological perspectives from the stability of skyrmions on cylindrical surfaces are discussed.

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The influence of the edge effect on the skyrmion generation in a magnetic nanotrack

Cited by 19 publications

References 55 publications

Bilayer skyrmion dynamics on a magnetic anisotropy gradient

Bilayer skyrmion dynamics on a magnetic anisotropy gradient

Influence of magnetic structure on the performance of twisted skyrmion-based nano-oscillator

Magnetic skyrmions in cylindrical ferromagnetic nanostructures with chiral interactions

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