Observation of asymmetry in domain wall velocity under transverse magnetic field
The dynamics of a magnetic domain wall (DW) under a transverse magnetic field Hy are investigated in two-dimensional (2D) Co/Ni microstrips, where an interfacial Dzyaloshinskii-Moriya interaction (DMI) exists with DMI vector D lying in +y direction. The DW velocity exhibits asymmetric behavior for ±...
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doaj-c8736a1a6ee0415b9a929e3e8e6101fe2020-11-25T01:02:44ZengAIP Publishing LLCAPL Materials2166-532X2016-03-0143032504032504-710.1063/1.4944897009692APMObservation of asymmetry in domain wall velocity under transverse magnetic fieldK.-J. Kim0Y. Yoshimura1T. Okuno2T. Moriyama3S.-W. Lee4K.-J. Lee5Y. Nakatani6T. Ono7Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, JapanInstitute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, JapanInstitute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, JapanInstitute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, JapanDepartment of Materials Science and Engineering, Korea University, Seoul 136-701, South KoreaDepartment of Materials Science and Engineering, Korea University, Seoul 136-701, South KoreaUniversity of Electro-communications, Chofu, Tokyo 182-8585, JapanInstitute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, JapanThe dynamics of a magnetic domain wall (DW) under a transverse magnetic field Hy are investigated in two-dimensional (2D) Co/Ni microstrips, where an interfacial Dzyaloshinskii-Moriya interaction (DMI) exists with DMI vector D lying in +y direction. The DW velocity exhibits asymmetric behavior for ±Hy; that is, the DW velocity becomes faster when Hy is applied antiparallel to D. The key experimental results are reproduced in a 2D micromagnetic simulation, which reveals that the interfacial DMI suppresses the periodic change of the average DW angle φ even above the Walker breakdown and that Hy changes φ, resulting in a velocity asymmetry. This suggests that the 2D DW motion, despite its microscopic complexity, simply depends on the average angle of the DW and thus can be described using a one-dimensional soliton model. These findings provide insight into the magnetic DW dynamics in 2D systems, which are important for emerging spin-orbitronic applications.http://dx.doi.org/10.1063/1.4944897 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
K.-J. Kim Y. Yoshimura T. Okuno T. Moriyama S.-W. Lee K.-J. Lee Y. Nakatani T. Ono |
spellingShingle |
K.-J. Kim Y. Yoshimura T. Okuno T. Moriyama S.-W. Lee K.-J. Lee Y. Nakatani T. Ono Observation of asymmetry in domain wall velocity under transverse magnetic field APL Materials |
author_facet |
K.-J. Kim Y. Yoshimura T. Okuno T. Moriyama S.-W. Lee K.-J. Lee Y. Nakatani T. Ono |
author_sort |
K.-J. Kim |
title |
Observation of asymmetry in domain wall velocity under transverse magnetic field |
title_short |
Observation of asymmetry in domain wall velocity under transverse magnetic field |
title_full |
Observation of asymmetry in domain wall velocity under transverse magnetic field |
title_fullStr |
Observation of asymmetry in domain wall velocity under transverse magnetic field |
title_full_unstemmed |
Observation of asymmetry in domain wall velocity under transverse magnetic field |
title_sort |
observation of asymmetry in domain wall velocity under transverse magnetic field |
publisher |
AIP Publishing LLC |
series |
APL Materials |
issn |
2166-532X |
publishDate |
2016-03-01 |
description |
The dynamics of a magnetic domain wall (DW) under a transverse magnetic field Hy are investigated in two-dimensional (2D) Co/Ni microstrips, where an interfacial Dzyaloshinskii-Moriya interaction (DMI) exists with DMI vector D lying in +y direction. The DW velocity exhibits asymmetric behavior for ±Hy; that is, the DW velocity becomes faster when Hy is applied antiparallel to D. The key experimental results are reproduced in a 2D micromagnetic simulation, which reveals that the interfacial DMI suppresses the periodic change of the average DW angle φ even above the Walker breakdown and that Hy changes φ, resulting in a velocity asymmetry. This suggests that the 2D DW motion, despite its microscopic complexity, simply depends on the average angle of the DW and thus can be described using a one-dimensional soliton model. These findings provide insight into the magnetic DW dynamics in 2D systems, which are important for emerging spin-orbitronic applications. |
url |
http://dx.doi.org/10.1063/1.4944897 |
work_keys_str_mv |
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