Magnetic skyrmion bubble motion driven by surface acoustic waves

Nepal, Rabindra; Güngördü, Utkan; Kovalev, Alexey A.

doi:10.1063/1.5013620

Cited by 39 publications

(39 citation statements)

References 48 publications

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“…One of the challenges is to achieve efficient control of the skyrmion dynamics. Skyrmion dynamics can be induced by spin transfer torques (STT) [45,46,47,48], spin-orbit torques (SOT) (often refered to as spin Hall effect torques) [47,49], voltage-controlled magnetic anisotropy [50], surface acoustic waves [51], temperature gradients [52,53,54,55], and other mechanisms.…”

Section: Dynamics Of Skyrmions and Antiskyrmionsmentioning

confidence: 99%

Skyrmions and Antiskyrmions in Quasi-Two-Dimensional Magnets

Kovalev¹,

Sandhoefner²

2018

Front. Phys.

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A stable skyrmion, representing the smallest realizable magnetic texture, could be an ideal element for ultra-dense magnetic memories. Here, we review recent progress in the field of skyrmionics, which is concerned with studies of tiny whirls of magnetic configurations for novel memory and logic applications, with a particular emphasis on antiskyrmions. Magnetic antiskyrmions represent analogs of skyrmions with opposite topological charge. Just like skyrmions, antiskyrmions can be stabilized by the Dzyaloshinskii-Moriya interaction, as has been demonstrated in a recent experiment. Here, we emphasize differences between skyrmions and antiskyrmions, e.g., in the context of the topological Hall effect, skyrmion Hall effect, as well as nucleation and stability. Recent progress suggests that anitskyrmions can be potentially useful for many device applications. Antiskyrmions offer advantages over skyrmions as they can be driven without the Hall-like motion, offer increased stability due to dipolar interactions, and can be realized above room temperature.

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Section: Dynamics Of Skyrmions and Antiskyrmionsmentioning

confidence: 99%

Skyrmions and Antiskyrmions in Quasi-Two-Dimensional Magnets

Kovalev¹,

Sandhoefner²

2018

Front. Phys.

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“…We first run the simulation for J 1 = 3, J 2 = 0.001 and various values of D. The simulation starts from randomized n r 's and stops when n r 's become stable. Previously, the Gilbert constant is taken to be α = 0.01 to 1 [16,19,20,22,23,25,27,28]. We find that the larger the value of α, the more rapid the simulation is completed, while the smaller the value of D, the longer the simulation time.…”

Section: A Skyrmion Generation From Random Initial Configurationsmentioning

confidence: 86%

Generation of magnetic skyrmions through pinning effect

2019

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Based on analytical estimation and lattice simulation, a proposal is made that magnetic skyrmions can be generated through the pinning effect in 2D chiral magnetic materials, in absence of an external magnetic field or magnetic anisotropy. In our simulation, stable magnetic skyrmions can be generated in the pinning areas. The properties of the skyrmions are studied for various values of ferromagnetic exchange strength and the Dzyaloshinskii-Moriya interaction strength.

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“…Using Eq. (8), the boundary condition (3) leads to the following equations: The boundary condition (11) then results in solution (10) where the position of the kink x 0 is given by equation:…”

Section: Semi-infinite Slab Geometrymentioning

confidence: 99%

“…The fidelity of skyrmion memory is guaranteed by the stability of the skyrmionic state, which owes this property to the topological nature of skyrmions [7]. The skyrmions can be controlled electrically [8,9], mechanically via acoustic waves [10], via uniaxial stress [11], or thermally [12][13][14][15]. Furthermore, multiferroicity in such materials as GaV 4 S 8 [16] enables the low-energy encoding and decoding of information via skyrmions.…”

Section: Introductionmentioning

confidence: 99%

Boundary twists, instabilities, and creation of skyrmions and antiskyrmions

Raeliarijaona

Nepal

Kovalev

2018

Phys. Rev. Materials

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We formulate and study the general boundary conditions dictating the magnetization profile in the vicinity of an interface between magnets with dissimilar properties. Boundary twists in the vicinity of an edge due to Dzyaloshinskii-Moriya interactions have been first discussed in [Wilson et al., Phys. Rev. B 88, 214420 (2013)] and in [Rohart and Thiaville, Phys. Rev. B 88, 184422 (2013)]. We show that in general case the boundary conditions lead to the magnetization profile corresponding to the Néel, Bloch, or intermediate twist. We explore how such twists can be utilized for creation of skyrmions and antiskyrmions, e.g., in a view of magnetic memory applications. To this end, we study various scenarios how skyrmions and antiskyrmions can be created from interface magnetization twists due to local instabilities. We also show that a judicious choice of Dzyaloshinskii-Moriya tensor (hence a carefully designed material) can lead to local instabilities generating certain types of skyrmions or antiskyrmions. The local instabilities are shown to appear in solutions of the Bogoliubov-de-Gennes equations describing ellipticity of magnon modes bound to interfaces. In one considered scenario, a skyrmion-antiskyrmion pair can be created due to instabilities at an interface between materials with properly engineered Dzyaloshinskii-Moriya interactions. We use micromagnetics simulations to confirm our analytical predictions.

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Magnetic skyrmion bubble motion driven by surface acoustic waves

Cited by 39 publications

References 48 publications

Skyrmions and Antiskyrmions in Quasi-Two-Dimensional Magnets

Skyrmions and Antiskyrmions in Quasi-Two-Dimensional Magnets

Generation of magnetic skyrmions through pinning effect

Boundary twists, instabilities, and creation of skyrmions and antiskyrmions

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