Domain wall motion at low current density in a synthetic antiferromagnet nanowire
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Published:2023-07-24
Issue:42
Volume:56
Page:425002
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ISSN:0022-3727
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Container-title:Journal of Physics D: Applied Physics
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language:
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Short-container-title:J. Phys. D: Appl. Phys.
Author:
E A Barker ChristopherORCID,
Finizio SimoneORCID,
Haltz EloiORCID,
Mayr Sina,
Shepley Philippa MORCID,
Moore Thomas AORCID,
Burnell GavinORCID,
Raabe JörgORCID,
Marrows Christopher HORCID
Abstract
Abstract
The current-driven motion of magnetic domain walls (DWs) is the working principle of magnetic racetrack memories. In this type of spintronic technology, high current densities are used to propel DW motion in magnetic nanowires, causing significant wire heating that corresponds to wasted energy. Synthetic antiferromagnets are known to show very fast DW motion at high current densities, but lower current densities around onset of motion have received less attention. Here we use scanning transmission x-ray microscopy to study the response of DWs in a SAF multilayer to short current pulses. We observe that the DWs depin at
(
3.5
±
0.4
)
×
10
11
A m−2 and move more quickly in response to 5 ns duration current pulses than in comparable multilayers that lack antiferromagnetic coupling. The results suggest that DWs in SAF structures are superior to conventional Néel DWs for low energy consumption racetrack technologies.
Funder
Seventh Framework Programme
Engineering and Physical Sciences Research Council
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Subject
Surfaces, Coatings and Films,Acoustics and Ultrasonics,Condensed Matter Physics,Electronic, Optical and Magnetic Materials