Field-driven domain wall motion in ferrimagnetic nanowires

Jing, K. Y.; Gong, X.; Wang, Xiang Rong

doi:10.1103/physrevb.106.174429

Cited by 6 publications

(3 citation statements)

References 47 publications

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“…An anisotropy gradient of 100 fJ (Vm) À1 and an insulating layer thickness of %1 nm are considered, which are comparable to experimental report. [34,35] The dynamics of the FiM skyrmion are investigated by solving the LLG equation: [36][37][38][39] , where μ s is the saturation moment and γ eff = (γ 1 þ γ 2 )/2 with γ 1 = 1.1 and γ 2 = 1.0. We set J = 8 Â 10 À22 J, D = 1.6 mJ m À2 the damping coefficient α = 0.2, the initial PMA strength on the left side K 0 = 0.28 MJ m À3 , and the PMA gradient dK/dx = 240-400 GJ m À4 , which are comparable to those of compound GdFeCo.…”

Section: Introductionmentioning

confidence: 99%

“…The dynamics of the FiM skyrmion are investigated by solving the LLG equation: [ 36–39 ]

$$\frac{\partial S_{i}}{\partial t} = - \frac{\left(\gamma\right)_{i}}{M_{i} \left(\right. 1 &amp;#x00026;amp;amp;amp;amp;amp;amp;amp;amp;plus; \left(\alpha\right)^{2} \left.\right)} S_{i} \times \left[\right.

…”

Section: Introductionmentioning

confidence: 99%

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Skyrmion Motion in Ferrimagnets Driven by Magnetic Anisotropy Gradient

Xu,

Yang,

Liu

et al. 2024

Physica Rapid Research Ltrs

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The topological skyrmions in ferrimagnet systems provide new opportunities to investigate the fundamental spin dynamics. Effective manipulation of ferrimagnet skyrmion motion is a vital task for future spintronics applications, motivating intense research on magnetization dynamics with voltage as driving sources. In this work, we investigated the skyrmion in ferromagnets driven by voltage controlled magnetic anisotropy gradients, which tends to move towards the low anisotropy area and has a constant velocity. We reported our Thiele’s theory analysis on the velocities of the skyrmion dependences on the anisotropy gradient, the net angular momentum density and the damping coefficient, which are confirmed nicely by the atomistic simulations. It is demonstrated that the velocity of the skyrmion reaches to a maximum value at a nonzero net angular momentum density δ s different from the domain wall and the Hall angle of ferrimagnet skyrmions can be controlled by δ s . Our results are useful for the understanding of ferrimagnet skyrmion dynamics and may open an alternative way for the design of ferrimagnet spintronic devices.This article is protected by copyright. All rights reserved.

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Section: Introductionmentioning

confidence: 99%

“…The dynamics of the FiM skyrmion are investigated by solving the LLG equation: [ 36–39 ]

$$\frac{\partial S_{i}}{\partial t} = - \frac{\left(\gamma\right)_{i}}{M_{i} \left(\right. 1 &amp;#x00026;amp;amp;amp;amp;amp;amp;amp;amp;plus; \left(\alpha\right)^{2} \left.\right)} S_{i} \times \left[\right.

…”

Section: Introductionmentioning

confidence: 99%

Skyrmion Motion in Ferrimagnets Driven by Magnetic Anisotropy Gradient

Xu,

Yang,

Liu

et al. 2024

Physica Rapid Research Ltrs

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“…such as in data storage devices [1][2][3] and logic operations [4,5]. Conventionally, there are several steering knobs, namely, magnetic fields [6][7][8][9][10][11], microwaves [12][13][14][15], and spin-polarized currents [16][17][18][19], to steer DW in magnetic nanostructures. But these steering knobs are suffering from certain limitations in device applications.…”

Section: Introductionmentioning

confidence: 99%

Role of SSW on thermal-gradient induced domain-wall dynamics

Akanda

Islam

Wang

2023

J. Phys.: Condens. Matter

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We study the thermal gradient (TG) induced domain wall (DW) dynamics in a uniaxial nanowire in the framework of the Stochastic-Landau-Lifshitz-Gilbert equation. TG drives the DW in a certain direction, and DW (linear and rotational) velocities increase with TG linearly, which can be explained by the magnonic angular momentum transfer to the DW. Interestingly, from Gilbert damping dependence of DW dynamics for fixed TG, we find that the DW velocity is significantly smaller even for lower damping, and DW velocity increases with damping (for a certain range of damping) and reaches a maximal value for critical damping which is contrary to our usual desire. This can be attributed to the formation of standing spin wave (SSW) modes (from the superposition of the spin waves and their reflection) together with travelling spin wave (TSW) modes. SSW does not carry any net energy/momentum to the DW, while TSW does. Damping $\alpha$ compels the spin current polarization to align with the local spin, which reduces the magnon propagation length and thus $\alpha$ hinders to generate SSWs, and contrarily the number of TSWs increases, which leads to the increment of DW speed with damping. For a similar reason, we observe that DW velocity increases with nanowire length and becomes saturated to maximal value for a certain length. Therefore, these findings may enhance the fundamental understanding as well as provide a way of utilizing the Joule heat in the spintronics (e.g., racetrack memory) devices.

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