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(Color online) (a) Schematic diagram of a rolled-up tube with the metallic contacts and used layer sequence. (b) Optical microscopy image of a periodic microtube array after roll-up. (c) Typical optical image of a rolled-up tube with ∼10 μm diameter, considered for MR measurements.
(Color online) Magnetic hysteresis loops of S1 at 300 K: (a) for the planar array before rolling and (b) the corresponding tube array after the roll-up process. The magnetic field was applied along the short and long axis of the structure.
(Color online) Room temperature magnetoresistance and resistance plotted against the applied magnetic field for a current of 10 μA of (a) S1 and (b) S2. The measurements were performed on the planar structure and the corresponding rolled-up tubes.
(Color online) (a) Schematic diagram of two [Co/Cu] multilayer stacks separated by a non-magnetic ML in the case of a tube with two windings. The boundary between neighboring windings is located at the Au/Al2O3 interface. (b) Cross-sectional SEM image of a rolled-up tube, obtained from S1.
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