期刊
NANO LETTERS
卷 19, 期 9, 页码 5930-5937出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b01504
关键词
Racetrack memory; current-induced nucleation; chiral coupling; Dzyaloshinskii-Moriya interaction; spin-orbit torques
类别
资金
- Swiss National Science Foundation [200020-172775]
- European Union's Horizon 2020 research and innovation programme under Marie Sklodowska-Curie Grant [794207]
Memory and logic devices that encode information in magnetic domains rely on the controlled injection of domain walls to reach their full potential. In this work, we exploit the chiral coupling, which is induced by the Dzyaloshinskii-Moriya interaction, between in-plane and out-of-plane magnetized regions of a Pt/Co/AlOx trilayer in combination with current-driven spin-orbit torques to control the injection of domain walls into magnetic conduits. We demonstrate that the current-induced domain nucleation is strongly inhibited for magnetic configurations stabilized by the chiral coupling and promoted for those that have the opposite chirality. These configurations allow for efficient domain wall injection using current densities of the order of 4 X 10(11) A m(-2), which are lower than those used in other injection schemes. Furthermore, by setting the orientation of the in-plane magnetization using an external field, we demonstrate the use of a chiral domain wall injector to create a controlled sequence of alternating domains in a racetrack structure driven by a steady stream of unipolar current pulses.
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