Deformation of the moving magnetic skyrmion lattice in MnSi under electric current flow

D. Okuyama; M. Bleuel; J. S. White; Q. Ye; J. Krzywon; G. Nagy; Z. Q. Im; I. Živković; M. Bartkowiak; H. M. Rønnow; S. Hoshino; J. Iwasaki; N. Nagaosa; A. Kikkawa; Y. Taguchi; Y. Tokura; D. Higashi; J. D. Reim; Y. Nambu; T. J. Sato

doi:10.1038/s42005-019-0175-z

Deformation of the moving magnetic skyrmion lattice in MnSi under electric current flow

D. Okuyama, M. Bleuel, J. S. White, Q. Ye, J. Krzywon, G. Nagy, Z. Q. Im, I. Živković, M. Bartkowiak, H. M. Rønnow, S. Hoshino, J. Iwasaki, N. Nagaosa, A. Kikkawa, Y. Taguchi, Y. Tokura, D. Higashi, J. D. Reim, Y. Nambu, T. J. Sato

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Abstract

Topological defects are found ubiquitously in various kinds of matter, such as vortices in type-II superconductors, and magnetic skyrmions in chiral ferromagnets. While knowledge on the static behavior of magnetic skyrmions is accumulating steadily, their dynamics under forced flow is still a widely open issue. Here, we report the deformation of the moving magnetic skyrmion lattice in MnSi under electric current flow observed using small-angle neutron scattering. A spatially inhomogeneous rotation of the skyrmion lattice, with an inverse rotation sense for opposite sample edges, is observed for current densities greater than a threshold value j_t ~ 1 MA m⁻ ² (10⁶ A m⁻ ²). Our result show that skyrmion lattices under current flow experience significant friction near the sample edges due to pinning, this being a critical effect that must be considered for anticipated skyrmion-based applications at the nanoscale.

Original language	English
Article number	79
Journal	Communications Physics
Volume	2
Issue number	1
DOIs	https://doi.org/10.1038/s42005-019-0175-z
State	Published - Dec 1 2019
Externally published	Yes

Funding

The authors thank P. D. Butler, K. Everschor, M. Garst, A. Rosch, T. Hanaguri, W. Koshibae, J. Barker, A.P. Tsai, K. Yamauchi and T. Oguchi for the fruitful discussions. This work was in part supported by Grants-in-Aids for Scientific Research (No. 24224009, 26103006, 16H04007, 17K14327, 17K18744, and 18H03676) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan and by the Research Program for CORE lab of “Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials” in “Network Joint Research Center for Materials and Devices”. The Swiss National Science Foundation (SNF) Sinergia network “NanoSkyrmionics” (Grant No. CRSII5-171003), the SNF projects 153451 and 166298, and the European Research Council project CONQUEST. N.N. was supported by JST CREST Grant Number JPMJCR1874.

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Okuyama, D., Bleuel, M., White, J. S., Ye, Q., Krzywon, J., Nagy, G., Im, Z. Q., Živković, I., Bartkowiak, M., Rønnow, H. M., Hoshino, S., Iwasaki, J., Nagaosa, N., Kikkawa, A., Taguchi, Y., Tokura, Y., Higashi, D., Reim, J. D., Nambu, Y., & Sato, T. J. (2019). Deformation of the moving magnetic skyrmion lattice in MnSi under electric current flow. Communications Physics, 2(1), Article 79. https://doi.org/10.1038/s42005-019-0175-z

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title = "Deformation of the moving magnetic skyrmion lattice in MnSi under electric current flow",

abstract = "Topological defects are found ubiquitously in various kinds of matter, such as vortices in type-II superconductors, and magnetic skyrmions in chiral ferromagnets. While knowledge on the static behavior of magnetic skyrmions is accumulating steadily, their dynamics under forced flow is still a widely open issue. Here, we report the deformation of the moving magnetic skyrmion lattice in MnSi under electric current flow observed using small-angle neutron scattering. A spatially inhomogeneous rotation of the skyrmion lattice, with an inverse rotation sense for opposite sample edges, is observed for current densities greater than a threshold value jt ~ 1 MA m− 2 (106 A m− 2). Our result show that skyrmion lattices under current flow experience significant friction near the sample edges due to pinning, this being a critical effect that must be considered for anticipated skyrmion-based applications at the nanoscale.",

author = "D. Okuyama and M. Bleuel and White, {J. S.} and Q. Ye and J. Krzywon and G. Nagy and Im, {Z. Q.} and I. {\v Z}ivkovi{\'c} and M. Bartkowiak and R{\o}nnow, {H. M.} and S. Hoshino and J. Iwasaki and N. Nagaosa and A. Kikkawa and Y. Taguchi and Y. Tokura and D. Higashi and Reim, {J. D.} and Y. Nambu and Sato, {T. J.}",

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doi = "10.1038/s42005-019-0175-z",

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Okuyama, D, Bleuel, M, White, JS, Ye, Q, Krzywon, J, Nagy, G, Im, ZQ, Živković, I, Bartkowiak, M, Rønnow, HM, Hoshino, S, Iwasaki, J, Nagaosa, N, Kikkawa, A, Taguchi, Y, Tokura, Y, Higashi, D, Reim, JD, Nambu, Y & Sato, TJ 2019, 'Deformation of the moving magnetic skyrmion lattice in MnSi under electric current flow', Communications Physics, vol. 2, no. 1, 79. https://doi.org/10.1038/s42005-019-0175-z

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T1 - Deformation of the moving magnetic skyrmion lattice in MnSi under electric current flow

AU - Okuyama, D.

AU - Bleuel, M.

AU - White, J. S.

AU - Ye, Q.

AU - Krzywon, J.

AU - Nagy, G.

AU - Im, Z. Q.

AU - Živković, I.

AU - Bartkowiak, M.

AU - Rønnow, H. M.

AU - Hoshino, S.

AU - Iwasaki, J.

AU - Nagaosa, N.

AU - Kikkawa, A.

AU - Taguchi, Y.

AU - Tokura, Y.

AU - Higashi, D.

AU - Reim, J. D.

AU - Nambu, Y.

AU - Sato, T. J.

PY - 2019/12/1

Y1 - 2019/12/1

N2 - Topological defects are found ubiquitously in various kinds of matter, such as vortices in type-II superconductors, and magnetic skyrmions in chiral ferromagnets. While knowledge on the static behavior of magnetic skyrmions is accumulating steadily, their dynamics under forced flow is still a widely open issue. Here, we report the deformation of the moving magnetic skyrmion lattice in MnSi under electric current flow observed using small-angle neutron scattering. A spatially inhomogeneous rotation of the skyrmion lattice, with an inverse rotation sense for opposite sample edges, is observed for current densities greater than a threshold value jt ~ 1 MA m− 2 (106 A m− 2). Our result show that skyrmion lattices under current flow experience significant friction near the sample edges due to pinning, this being a critical effect that must be considered for anticipated skyrmion-based applications at the nanoscale.

AB - Topological defects are found ubiquitously in various kinds of matter, such as vortices in type-II superconductors, and magnetic skyrmions in chiral ferromagnets. While knowledge on the static behavior of magnetic skyrmions is accumulating steadily, their dynamics under forced flow is still a widely open issue. Here, we report the deformation of the moving magnetic skyrmion lattice in MnSi under electric current flow observed using small-angle neutron scattering. A spatially inhomogeneous rotation of the skyrmion lattice, with an inverse rotation sense for opposite sample edges, is observed for current densities greater than a threshold value jt ~ 1 MA m− 2 (106 A m− 2). Our result show that skyrmion lattices under current flow experience significant friction near the sample edges due to pinning, this being a critical effect that must be considered for anticipated skyrmion-based applications at the nanoscale.

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JO - Communications Physics

JF - Communications Physics

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Deformation of the moving magnetic skyrmion lattice in MnSi under electric current flow

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