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Issue 14, 2019
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Controlled modification of skyrmion information in a three-terminal racetrack memory

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Abstract

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.

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

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Article information


Submitted
28 Jan 2019
Accepted
12 Mar 2019
First published
13 Mar 2019

Nanoscale, 2019,11, 6952-6961
Article type
Paper
Author version available

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

K. Wang, L. Qian, S. Ying, G. Xiao and X. Wu, Nanoscale, 2019, 11, 6952
DOI: 10.1039/C9NR00909D

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