Skyrmion Creation and Manipulation by Nano-Second Current Pulses

Sci Rep. 2016 Mar 3:6:22638. doi: 10.1038/srep22638.

H Y Yuan ¹ ², X R Wang ² ³

Affiliations

1 School of Microelectrics and Solid-State Electronics, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China.
2 Physics Department, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
3 HKUST Shenzhen Research Institute, Shenzhen 518057, China.

PMID: 26934954 DOI: 10.1038/srep22638

Abstract

Easy creation and manipulation of skyrmions is important in skyrmion based devices for data storage and information processing. We show that a nano-second current pulse alone is capable of creating/deleting and manipulating skyrmions in a spin valve with a perpendicularly magnetized free layer and broken chiral symmetry. Interestingly, for an in-plane magnetized fixed layer, the free layer changes from a single domain at zero current to a Neel wall at an intermediate current density. Reverse the current polarity, the Neel wall changes to its image inversion. A properly designed nano-second current pulse, that tends to convert one type of Neel walls to its image inversion, ends up to create a stable skyrmion without assistance of external fields. For a perpendicularly magnetized fixed layer, the skyrmion size can be effectively tuned by a current density.

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