scholarly journals Manipulation of Skyrmion Motion Dynamics for Logical Device Application Mediated by Inhomogeneous Magnetic Anisotropy

Nanomaterials ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 278
Jia-Qiang Lin ◽  
Ji-Pei Chen ◽  
Zhen-Yu Tan ◽  
Yuan Chen ◽  
Zhi-Feng Chen ◽  

Magnetic skyrmions are promising potential information carriers for future spintronic devices owing to their nanoscale size, non-volatility and high mobility. In this work, we demonstrate the controlled manipulation of skyrmion motion and its implementation in a new concept of racetrack logical device by introducing an inhomogeneous perpendicular magnetic anisotropy (PMA) via micromagnetic simulation. Here, the inhomogeneous PMA can be introduced by a capping nano-island that serves as a tunable potential barriers/well which can effectively modulate the size and shape of isolated skyrmion. Using the inhomogeneous PMA in skyrmion-based racetrack enables the manipulation of skyrmion motion behaviors, for instance, blocking, trapping or allowing passing the injected skyrmion. In addition, the skyrmion trapping operation can be further exploited in developing special designed racetrack devices with logic AND and NOT, wherein a set of logic AND operations can be realized via skyrmion–skyrmion repulsion between two skyrmions. These results indicate an effective method for tailoring the skyrmion structures and motion behaviors by using inhomogeneous PMA, which further provide a new pathway to all-electric skyrmion-based memory and logic devices.

Anruo Zhong ◽  
Xiaoming Lan ◽  
Yangfan Hu ◽  
Biao Wang

Abstract Magnetic skyrmions are attracting much attention due to their nontrivial topology and high mobility to electric current. Nevertheless, suppression of the skyrmion Hall effect and maintaining high velocity of skyrmions with low energy cost are two major challenges concerning skyrmion-based spintronic devices. Here we show theoretically that in a nano-beam suffering appropriate bending moment, both Bloch-type and Néel-type skyrmions move with a vanishing Hall angle under a current density smaller than that required when the bending is absent. Moreover, bending alone can be used to move skyrmions, whose velocity is solved analytically from the Thiele equation. Generally speaking, inhomogeneous elastic fields affect the stability and dynamics of skyrmions, where the local stability is dominantly determined by the local bulk stress. These findings throw new light on how to drive skyrmions straightly with lower energy cost, which is vital for utilizing skyrmions as information carriers.

2009 ◽  
Vol 94 (12) ◽  
pp. 122503 ◽  
Feng Wu ◽  
Shigemi Mizukami ◽  
Daisuke Watanabe ◽  
Hiroshi Naganuma ◽  
Mikihiko Oogane ◽  

2021 ◽  
Vol 13 (1) ◽  
Kyoung-Woong Moon ◽  
Seungmo Yang ◽  
Tae-Seong Ju ◽  
Changsoo Kim ◽  
Byoung Sun Chun ◽  

AbstractMagnetic skyrmions, which are topological swirling spin textures, have drawn much attention in spintronics because of their use as an information carrier with distinct robustness rooted in their topological nature. Real-time generation of skyrmions is therefore imperative for realizing skyrmion-based spintronic devices. However, to date, experimental demonstration has been limited to exquisite works with well-tuned samples. Here, we report a method to generate skyrmions by driving the stripe instability via an in-plane magnetic field. We have demonstrated that the key parameter determining the stripe domain instability is the stripe width, regardless of other material parameters. This skyrmion generation method can be applicable to generic magnetic films with perpendicular magnetic anisotropy. Our work will facilitate the development of skyrmion-based devices by offering a general method for controlling a large skyrmion population.

2010 ◽  
Vol 3 (9) ◽  
pp. 093002 ◽  
Wenhong Wang ◽  
Hiroaki Sukegawa ◽  
Koichiro Inomata

A.E.M. De Veirman ◽  
F.J.G. Hakkens ◽  
W.M.J. Coene ◽  
F.J.A. den Broeder

There is currently great interest in magnetic multilayer (ML) thin films (see e.g.), because they display some interesting magnetic properties. Co/Pd and Co/Au ML systems exhibit perpendicular magnetic anisotropy below certain Co layer thicknesses, which makes them candidates for applications in the field of magneto-optical recording. It has been found that the magnetic anisotropy of a particular system strongly depends on the preparation method (vapour deposition, sputtering, ion beam sputtering) as well as on the substrate, underlayer and deposition temperature. In order to get a better understanding of the correlation between microstructure and properties a thorough cross-sectional transmission electron microscopy (XTEM) study of vapour deposited Co/Pd and Co/Au (111) MLs was undertaken (for more detailed results see ref.).The Co/Pd films (with fixed Pd thickness of 2.2 nm) were deposited on mica substrates at substrate temperatures Ts of 20°C and 200°C, after prior deposition of a 100 nm Pd underlayer at 450°C.

2002 ◽  
Vol 81 (21) ◽  
pp. 4017-4019 ◽  
T. G. Kim ◽  
Y. H. Shin ◽  
J. H. Song ◽  
M. C. Sung ◽  
I. S. Kim ◽  

2021 ◽  
pp. 1-1
I. Benguettat-El Mokhtari ◽  
Y. Roussigne ◽  
S. M. Cherif ◽  
S. Auffret ◽  
C. Baraduc ◽  

AIP Advances ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 025106
Xinjun Wang ◽  
Sergiy Krylyuk ◽  
Daniel Josell ◽  
Delin Zhang ◽  
Deyuan Lyu ◽  

RSC Advances ◽  
2020 ◽  
Vol 10 (19) ◽  
pp. 11219-11224
Wei Zhang ◽  
Xiaoxiong Jia ◽  
Rui Wang ◽  
Huihui Liu ◽  
Zhengyu Xiao ◽  

Thin films with perpendicular magnetic anisotropy (PMA) play an essential role in the development of technologies due to their excellent thermal stability and potential application in devices with high density, high stability, and low energy consumption.

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