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2017 ; 7
(ä): 45330
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An Improved Racetrack Structure for Transporting a Skyrmion
#MMPMID28358009
Lai P
; Zhao GP
; Tang H
; Ran N
; Wu SQ
; Xia J
; Zhang X
; Zhou Y
Sci Rep
2017[Mar]; 7
(ä): 45330
PMID28358009
show ga
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.