Interface-driven chiral magnetism and current-driven domain walls in insulating magnetic garnets
Name
s41565-019-0421-2.pdf
Description
Accepted version
Size
2.88 MB
Format
Adobe PDF
Checksum (MD5)
a0eea13bb10ccaa808f6b99dd70fa3d7
Author(s)
Avci, Can Onur
Rosenberg, Ethan
Caretta, Lucas
Büttner, Felix
Mann, Maxwell
Marcus, Colin
Bono, David
Ross, Caroline A
Beach, Geoffrey SD
Date Issued
2019
Journal
Nature Nanotechnology
Publisher
Springer Science and Business Media LLC
Version
Author's final manuscript
Abstract
© 2019, The Author(s), under exclusive licence to Springer Nature Limited. Magnetic oxides exhibit rich fundamental physics1–4 and technologically desirable properties for spin-based memory, logic and signal transmission5–7. Recently, spin–orbit-induced spin transport phenomena have been realized in insulating magnetic oxides by using proximate heavy metal layers such as platinum8–10. In their metallic ferromagnet counterparts, such interfaces also give rise to a Dzyaloshinskii–Moriya interaction11–13 that can stabilize homochiral domain walls and skyrmions with efficient current-driven dynamics. However, chiral magnetism in centrosymmetric oxides has not yet been observed. Here we discover chiral magnetism that allows for pure spin-current-driven domain wall motion in the most ubiquitous class of magnetic oxides, ferrimagnetic iron garnets. We show that epitaxial rare-earth iron garnet films with perpendicular magnetic anisotropy exhibit homochiral Néel domain walls that can be propelled faster than 800 m s−1 by spin current from an adjacent platinum layer. We find that, despite the relatively small interfacial Dzyaloshinskii–Moriya interaction, very high velocities can be attained due to the antiferromagnetic spin dynamics associated with ferrimagnetic order.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1038/s41565-019-0421-2
