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Schematic of the magnet-superconductor hybrid structure consisting of a permanent magnet, a ferromagnetic stripe array, and an insulating layer (substrate 1) positioned below a SC layer (substrate 2). Uniform applied field is redistributed and amplified over the ferromagnetic regions. The use of a rotary translation stage attached to substrate 1 allows accurate positioning and 90° rotations of the ferromagnetic stripe array with respect to the superconductor layer for switching between (a) persistent and (b) normal states.
Illustration of the directional current flow dependence of the magnet-superconductor hybrid structure.
[(a)–(d)] Fabrication process flow of the test structure and (e) scanning electron micrographs of the fabricated test structure.
(a) SHPM image of the sample at 300 K and 5 kOe applied field. (b) Magnetic field profile across the Co stripes. (c) plot of the control film without Co stripes.
(a) curves at 4.2 K and 5 kOe for both current directions. (b) Critical current density plot. The difference in at zero applied field is due to remnant magnetization of Co stripes.
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