Domain wall dynamics of ferrimagnets influenced by spin current near the angular momentum compensation temperature

Yurlov, V. V.; Zvezdin, K. A.; Skirdkov, P. N.; Zvezdin, A. K.

doi:10.1103/physrevb.103.134442

Cited by 14 publications

(2 citation statements)

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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%

See 1 more Smart Citation

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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