Existence and stability of skyrmion bags in thin magnetic films

Kind, Charles; Friedemann, Sven; Read, Dan

doi:10.1063/1.5127173

Cited by 18 publications

(15 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The notation we use to describe the simple skyrmion bags, possessing only a number of individual antiskyrmions inside the outer skyrmion, is S (N ), where n is the number of antiskyrmions and the total degree is therefore Q = N − 1 [9,11]. We use S(0) as the label for a single skyrmion.…”

Section: Introductionmentioning

confidence: 99%

Magnetic skyrmion binning

Kind

Foster

2021

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

When spin polarised electrons flow through a magnetic texture a transfer torque is generated. We examine the effect of this torque on skyrmions and skyrmion bags, skyrmionic structures of arbitrary integer topological degree, in thin ferromagnetic films. Using micromagnetic simulations and analysis from the well known Thiele equation we explore the potential for sorting or binning skyrmions of varying degrees mechanically. We investigate the applicability of the Thiele equation to problems of this nature and derive a theory of skyrmion deflection ordered by topological degree. We show that skyrmions and skyrmion bags have the potential to move in different directions under constant current which has significant potential for technical applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Magnetic skyrmion binning

Kind

Foster

2021

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

show abstract

“…Due to the inner interactions in skyrmion bags, the maximum magnetic anisotropy constant allowed to exist is the key to the dynamics of skyrmion bags driven by an anisotropy gradient [38]. Hence, we investigated the maximum magnetic anisotropy constant allowed for the stable existence of skyrmion bags with topological charge Q ranging from 0 to 10, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

The skyrmion bags in an anisotropy gradient

Zeng,

Mehmood,

et al. 2022

Preprint

View full text Add to dashboard Cite

Skyrmion bags as spin textures with arbitrary topological charge are expected to be the carriers in racetrack memory. Here, we theoretically and numerically investigated the dynamics of skyrmion bags in an anisotropy gradient. It is found that, without the boundary potential, the dynamics of skyrmion bags are dependent on the spin textures, and the velocity of skyrmionium with Q = 0 is faster than other skyrmion bags. However, when the skyrmion bags move along the boundary, the velocities of all skyrmion bags with different Q are same. This can be attributed to the same value of u/ηxx, where the u and ηxx are the terms related to the magnetization distribution of skyrmion bag. In addition, we theoretically derived the dynamics of skyrmion bags in the two cases using the Thiele approach and discussed the scope of Thiele equation. Within a certain range, the simulation results are in good agreement with the analytically calculated results. Our findings provide an alternative way to manipulate the racetrack memory based on the skyrmion bags.

show abstract

“…[46,51,52] By numerical simulations, the interaction of stable skyrmion bags in the liquid crystal is similar to that of large skyrmions. [46] Moreover, the stability and current-induced motions of skyrmion bags have been investigated by micromagnetic simulations and in experiment, [46,48,51,[53][54][55] the spintronic devices with tunable magnetic fields and variable topological charge driven by current have important application prospects. [46,48,51,53,54,56] Up to now, the in-plane spin excitation modes of skyrmion bags are still unclear.…”

Section: Introductionmentioning

confidence: 99%

“…[46] Moreover, the stability and current-induced motions of skyrmion bags have been investigated by micromagnetic simulations and in experiment, [46,48,51,[53][54][55] the spintronic devices with tunable magnetic fields and variable topological charge driven by current have important application prospects. [46,48,51,53,54,56] Up to now, the in-plane spin excitation modes of skyrmion bags are still unclear. The in-plane spin excitations of skyrmion bags should be richer than those of skyrmions, because of the nested structure.…”

Section: Introductionmentioning

confidence: 99%

In-plane spin excitation of skyrmion bags

Liu

et al. 2023

Chinese Phys. B

View full text Add to dashboard Cite

Skyrmion bags are spin structures with arbitrary topological charges, which consist of a large skyrmion and multiple small skyrmions. In this work, by applying in-plane ac magnetic fields, we investigate the spin-wave modes of skyrmion bags, which behave differently from the clockwise (CW) and counterclockwise (CCW) rotation modes of skyrmions because of their complex spin topological structure. The in-plane excitation power spectral density shows that there are four resonance frequencies for each skyrmion bag. By further calculating the spin dynamics of a skyrmion bag at each resonant frequency, the four spin-wave modes appear as the composition modes of outer skyrmion-inner skyrmions, i.e., a CCW-CW mode, two CW-breathing modes with different resonance strength, and an inner CCW mode. Our results provide an understanding of the in-plane spin excitation of skyrmion bags, which may contribute to the characterization and detection of skyrmion bags, as well as the applications in logic devices.

show abstract

Existence and stability of skyrmion bags in thin magnetic films

Cited by 18 publications

References 21 publications

Magnetic skyrmion binning

Magnetic skyrmion binning

The skyrmion bags in an anisotropy gradient

In-plane spin excitation of skyrmion bags

Contact Info

Product

Resources

About