Controlled modification of skyrmion information in a three-terminal racetrack memory

Manipulation of magnetic skyrmions has been generating considerable interest because of their potential applications in future spintronic devices. As an information carrier, a skyrmion is used to code a bit. In this work, we study via micromagnetic simulations a three-terminal racetrack memory, wher...

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Bibliographic Details
Published in:Nanoscale 2019-04, Vol.11 (14), p.6952-6961
Main Authors: Wang, Kang, Qian, Lijuan, Ying, See-Chen, Xiao, Gang, Wu, Xiaoshan
Format: Article
Language:English
Subjects:
Breathing
Computer simulation
Coupled modes
Gyration
Hypothetical particles
Particle theory
Potential energy
Racetracks
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Summary:Manipulation of magnetic skyrmions has been generating considerable interest because of their potential applications in future spintronic devices. As an information carrier, a skyrmion is used to code a bit. In this work, we study via micromagnetic simulations a three-terminal racetrack memory, where an isolated skyrmion can be generated and annihilated by the gate voltage pulse. Thus, we can modify a train of skyrmion codes written at the generator in a controlled manner. The modified information is then detected at the collector. We have identified both gyration and breathing modes during skyrmion manipulation. The dynamics is analysed via a Thiele equation derived from the micromagnetic model. From the equation, the gyration mode of a skyrmion is suggested to be coupled to the breathing mode dynamics. This work proposes an effective method for controlled modification of skyrmion information in a potential energy-efficient racetrack memory, and provides a fundamental understanding of the intrinsic skyrmion dynamics during skyrmion manipulation.
ISSN:2040-3364
2040-3372
DOI:10.1039/c9nr00909d