Fast current-driven domain walls and small skyrmions in a compensated ferrimagnet
Name
s41565-018-0255-3.pdf
Description
Accepted version
Size
4.46 MB
Format
Adobe PDF
Checksum (MD5)
a02b53fdeebfa0a3688d0babe0167d8e
Author(s)
Caretta, Lucas
Mann, Maxwell
Büttner, Felix
Ueda, Kohei
Pfau, Bastian
Günther, Christian M
Hessing, Piet
Churikova, Alexandra
Klose, Christopher
Schneider, Michael
Date Issued
2018
Journal
Nature Nanotechnology
Publisher
Springer Science and Business Media LLC
Version
Author's final manuscript
Abstract
© 2018, The Author(s), under exclusive licence to Springer Nature Limited. Spintronics is a research field that aims to understand and control spins on the nanoscale and should enable next-generation data storage and manipulation. One technological and scientific key challenge is to stabilize small spin textures and to move them efficiently with high velocities. For a long time, research focused on ferromagnetic materials, but ferromagnets show fundamental limits for speed and size. Here, we circumvent these limits using compensated ferrimagnets. Using ferrimagnetic Pt/Gd44Co56/TaOx films with a sizeable Dzyaloshinskii–Moriya interaction, we realize a current-driven domain wall motion with a speed of 1.3 km s–1 near the angular momentum compensation temperature (TA) and room-temperature-stable skyrmions with minimum diameters close to 10 nm near the magnetic compensation temperature (TM). Both the size and dynamics of the ferrimagnet are in excellent agreement with a simplified effective ferromagnet theory. Our work shows that high-speed, high-density spintronics devices based on current-driven spin textures can be realized using materials in which TA and TM are close together.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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DOI of Published Version
https://doi.org/10.1038/S41565-018-0255-3
