Electrical probing of field-driven cascading quantized transitions of skyrmion cluster states in MnSi nanowires

Haifeng Du, Dong Liang, Chiming Jin, Lingyao Kong, Matthew J. Stolt, Wei Ning, Jiyong Yang, Ying Xing, Jian Wang, Renchao Che, Jiadong Zang (), Song Jin (), Yuheng Zhang and Mingliang Tian ()
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Haifeng Du: High Magnetic Field Laboratory, Chinese Academy of Science (CAS)
Dong Liang: University of Wisconsin—Madison
Chiming Jin: High Magnetic Field Laboratory, Chinese Academy of Science (CAS)
Lingyao Kong: Institute of Fluid Physics, China Academy of Engineering Physics
Matthew J. Stolt: University of Wisconsin—Madison
Wei Ning: High Magnetic Field Laboratory, Chinese Academy of Science (CAS)
Jiyong Yang: High Magnetic Field Laboratory, Chinese Academy of Science (CAS)
Ying Xing: International Center for Quantum Materials, School of Physics, Peking University
Jian Wang: International Center for Quantum Materials, School of Physics, Peking University
Renchao Che: Advanced Materials Laboratory, Fudan University
Jiadong Zang: Johns Hopkins University
Song Jin: University of Wisconsin—Madison
Yuheng Zhang: High Magnetic Field Laboratory, Chinese Academy of Science (CAS)
Mingliang Tian: High Magnetic Field Laboratory, Chinese Academy of Science (CAS)

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract Magnetic skyrmions are topologically stable whirlpool-like spin textures that offer great promise as information carriers for future spintronic devices. To enable such applications, particular attention has been focused on the properties of skyrmions in highly confined geometries such as one-dimensional nanowires. Hitherto, it is still experimentally unclear what happens when the width of the nanowire is comparable to that of a single skyrmion. Here, we achieve this by measuring the magnetoresistance in ultra-narrow MnSi nanowires. We observe quantized jumps in magnetoresistance versus magnetic field curves. By tracking the size dependence of the jump number, we infer that skyrmions are assembled into cluster states with a tunable number of skyrmions, in agreement with the Monte Carlo simulations. Our results enable an electric reading of the number of skyrmions in the cluster states, thus laying a solid foundation to realize skyrmion-based memory devices.

Date: 2015
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DOI: 10.1038/ncomms8637

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