Manipulating current induced motion of magnetic skyrmions in the magnetic nanotrack

Ding, Junwei; Yang, Xiaofei; Zhu, Tao

doi:10.1088/0022-3727/48/11/115004

Cited by 51 publications

(37 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4(b) can be well fitted by two parabolic functions, which are and for Nd 2 Fe 14 B and SmCo 5 respectively. For small driving current, the skyrmion speed is roughly proportional to the driving current, consistent with those observed in other literatures281835. When the current is larger, however, the skyrmion speed becomes saturated.…”

Section: Resultssupporting

confidence: 91%

See 1 more Smart Citation

An Improved Racetrack Structure for Transporting a Skyrmion

Peng

Zhao

Tang

et al. 2017

Sci Rep

119

View full text Add to dashboard Cite

Magnetic skyrmions are promising building blocks for next generation data storage due to their stability, small size and extremely low currents to drive them, which can be used instead of traditional magnetic domain walls to store information as data bits in metalic racetrack memories. However, skyrmions can drift from the direction of electron flow due to the Magnus force and thus may annihilate at the racetrack edges, resulting in the loss of information. Here we propose a new skyrmion-based racetrack structure by adding high-K materials (materials with high magnetic crystalline anisotropy) at the edges, which confines the skyrmions in the center region of the metalic racetrack efficiently. This design can overcome both the clogging and annihilation of skyrmions according to our micromagnetic simulation, which occur normally for skyrmions moving on a racetrack under small and large driving currents, respectively. Phase diagrams for skyrmion motion on the proposed racetrack with various values of current density and racetrack edge width have been calculated and given, showing that skyrmions can be driven at a high speed (about 300 m/s) in the racetrack under relatively smaller driving currents. This design offers the possiblity of building an ultrafast and energy-efficient skyrmion transport device.

show abstract

Section: Resultssupporting

confidence: 91%

“…29, where a much larger polarization of 0.7 was used. The efficiency for the velocity versus the current in this work is about 40 m/s per MA/cm 2 , also much larger than that calculated by other groups2818293035. It is noted that the skyrmion size and track width in Fig.…”

Section: Resultscontrasting

confidence: 48%

An Improved Racetrack Structure for Transporting a Skyrmion

Peng

Zhao

Tang

et al. 2017

Sci Rep

119

View full text Add to dashboard Cite

show abstract

“…where m x , m y , m z are components of normalized magnetization and D the continuous effective DM interaction constant [28]. Here, we consider a magnetic nanowire with dimension of 1000×40×0.4 nm 3 in the numerical simulation.…”

Section: Simulation Methodsmentioning

confidence: 99%

“…We take magnetic material parameters of a perpendicularly magnetized Pt/Co system [29], [30]: injected perpendicular to the plane of wire [18]. After the injection, the magnetization state is relaxed for 10 ns when the skyrmion is stable [28]. The configuration of the isolated skyrmion is shown in Fig.…”

Section: Simulation Methodsmentioning

confidence: 99%

The Motion of Magnetic Skyrmions Driven by Propagating Spin Waves

2015

Self Cite

View full text Add to dashboard Cite

The motion of magnetic skyrmions driven by propagating spin waves (SWs) in a skyrmion-based magnetic nanotrack is investigated by means of micromagnetic simulation. It is found that the propagating SWs can drive the skyrmion into a stream motion. The velocity of the skyrmion motion is controlled by the changes of SWs frequency and exciting field amplitude, which is sensitive to the size of skyrmion.Index Terms-magnetic skyrmions, spin waves, spin wave frequency.

show abstract

“…First of which is the presence of a skyrmion Hall effect which leads to a transverse motion of the skyrmion under an electric current. This behavior often leads to skyrmion annihilation at the nanowire edges and imposes a speed limit for skyrmions [1,5,[8][9][10][11][12]. Secondly, as skyrmions are magnetically charged, they experience significant repulsion with each other [6].…”

Section: Introductionmentioning

confidence: 99%

Efficient in-line skyrmion injection method for synthetic antiferromagnetic systems

2018

View full text Add to dashboard Cite

Although it has been proposed that antiferromagnetically-coupled skyrmions can be driven at extremely high speeds, such skyrmions are near impossible to inject with current methods. In this paper, we propose the use of DMI-induced edge magnetization tilting to perform in-line skyrmion injection in a synthetic antiferromagnetic branched nanostructure. The proposed method circumvents the skyrmion topological protection and lowers the required current density. By allowing additional domain walls (DWs) to form on the branch, the threshold injection current density was further reduced by 59%. The increased efficiency was attributed to inter-DW repulsion and DW compression. The former acts as a multiplier to the effective field experienced by the pinned DW while the latter allows DWs to accumulate enough energy for depinning. The branch geometry also enables skyrmions to be shifted and deleted with the use of only three terminals, thus acting as a highly scalable skyrmion memory block.

show abstract

Manipulating current induced motion of magnetic skyrmions in the magnetic nanotrack

Cited by 51 publications

References 39 publications

An Improved Racetrack Structure for Transporting a Skyrmion

An Improved Racetrack Structure for Transporting a Skyrmion

The Motion of Magnetic Skyrmions Driven by Propagating Spin Waves

Efficient in-line skyrmion injection method for synthetic antiferromagnetic systems

Contact Info

Product

Resources

About