Journal
PHYSICAL REVIEW B
Volume 95, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.95.144504
Keywords
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Funding
- U.S. Department of Energy (DOE), Office of Science, Materials Sciences and Engineering Division
- Sao Paulo Research Foundation (FAPESP) [2015/06.085-3]
- U.S. DOE, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- French National Research Agency (ANR) project SUPERTRONICS.
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We image the motion of superconducting vortices in niobium film covered with a regular array of thin permalloy strips. By altering the magnetization orientation in the strips using a small in-plane magnetic field, we can tune the strength of interactions between vortices and the strip edges, enabling acceleration or retardation of the superconducting vortices in the sample and consequently introducing strong tunable anisotropy into the vortex dynamics. We discuss our observations in terms of the attraction/ repulsion between point magnetic charges carried by vortices and lines of magnetic charges at the strip edges and derive analytical formulas for the vortex-magnetic strips coupling. Our approach demonstrates the analogy between the vortex motion regulated by the magnetic strip array and electric carrier flow in gated semiconducting devices. Scaling down the geometrical features of the proposed design may enable controlled manipulation of single vortices, paving the way for Abrikosov vortex microcircuits and memories.
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