Observation of asymmetry in domain wall velocity under transverse magnetic field

K. J. Kim; Y. Yoshimura; T. Okuno; T. Moriyama; S. W. Lee; K. J. Lee; Y. Nakatani; T. Ono

doi:10.1063/1.4944897

Observation of asymmetry in domain wall velocity under transverse magnetic field

K. J. Kim, Y. Yoshimura, T. Okuno, T. Moriyama, S. W. Lee, K. J. Lee, Y. Nakatani, T. Ono

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

The dynamics of a magnetic domain wall (DW) under a transverse magnetic field H_y 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 ±H_y; that is, the DW velocity becomes faster when H_y 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 H_y 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.

Original language	English
Article number	032504
Journal	APL Materials
Volume	4
Issue number	3
DOIs	https://doi.org/10.1063/1.4944897
Publication status	Published - 2016 Mar

ASJC Scopus subject areas

Materials Science(all)
Engineering(all)

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title = "Observation of asymmetry in domain wall velocity under transverse magnetic field",

abstract = "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.",

author = "Kim, {K. J.} and Y. Yoshimura and T. Okuno and T. Moriyama and Lee, {S. W.} and Lee, {K. J.} and Y. Nakatani and T. Ono",

note = "Funding Information: This work was partly supported by JSPS KAKENHI Grant Numbers 15H05702, 26870300, 26870304, 26103002, 26390008, 25?4251, Collaborative Research Program of the Institute for Chemical Research, Kyoto University, and R & D Project for ICT Key Technology of MEXT from the Japan Society for the Promotion of Science (JSPS). S.-W.L. and K.-J.L. acknowledge support from the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (NRF-2013R1A2A2A01013188, 2015M3D1A1070465). Publisher Copyright: {\textcopyright} 2016 Author(s).",

year = "2016",

month = mar,

doi = "10.1063/1.4944897",

language = "English",

volume = "4",

journal = "APL Materials",

issn = "2166-532X",

publisher = "American Institute of Physics Publising LLC",

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T1 - Observation of asymmetry in domain wall velocity under transverse magnetic field

AU - Kim, K. J.

AU - Yoshimura, Y.

AU - Okuno, T.

AU - Moriyama, T.

AU - Lee, S. W.

AU - Lee, K. J.

AU - Nakatani, Y.

AU - Ono, T.

N1 - Funding Information: This work was partly supported by JSPS KAKENHI Grant Numbers 15H05702, 26870300, 26870304, 26103002, 26390008, 25?4251, Collaborative Research Program of the Institute for Chemical Research, Kyoto University, and R & D Project for ICT Key Technology of MEXT from the Japan Society for the Promotion of Science (JSPS). S.-W.L. and K.-J.L. acknowledge support from the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (NRF-2013R1A2A2A01013188, 2015M3D1A1070465). Publisher Copyright: © 2016 Author(s).

PY - 2016/3

Y1 - 2016/3

N2 - 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.

AB - 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.

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Observation of asymmetry in domain wall velocity under transverse magnetic field

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