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Magnetic pinning of flux lattice in superconducting-nanomagnet hybrids
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) (a) AFM image of part of the sample (the ring dimensions are an outer diameter of 700 nm, a width of 125 nm, the array period is 820 nm, and covered a 100 µm × 100 µm overall area). (b) MFM images of part of the sample after being magnetized into onion states with a field from left to right. Each ring shows a black and a white contrast at the ends of a diameter corresponding to the two domain walls. Outlines of two ring locations are indicated in (b). (c) OOMMF simulation of an onion state with the 180° domain walls indicated. (d) Out-of-plane field at a height of 60 nm above the center of the rings in an onion state array, corresponding to mid-thickness of the Nb layer, calculated bases on treating the walls as monopoles. In each ring, right and left spots represent positive and negative field values.

Image of FIG. 2.
FIG. 2.

(Color online) MOKE and MFM measurements of remanence after positive saturation and the subsequent application of a reverse field (HR ), with the stable remanent domain configurations indicated. The MOKE data are normalized to the remanence after saturation. The MFM data are normalized by assuming each onion state ring contributes a remanence of ±1 and each vortex state contributes 0. The inset is a major hysteresis loop measured by MOKE with a minor loop starting from −380 Oe and a calculated OOMMF hysteresis loop of a single rough circular ring.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Magnetoresistance of Ni ring array covered by a Nb thin film at temperature T = 0.99 T/Tc. Filled green circles show data when the rings were in the demagnetized state, empty black circles from the magnetic vortex state, filled red diamonds from the onion state with vortex motion parallel to the remanent magnetization direction and blue triangles from the onion state with the vortex lattice motion perpendicular to the remanent magnetization direction. (b) Background Rb of the magnetoresistance curves of (a) fitted to a second order polynomial (green dash-dot line: demagnetized state, black dot line: magnetic vortex state, and red short dash line: onion state with the vortex motion parallel to the magnetization and blue solid line: onion state with the vortex lattice motion perpendicular to the magnetization) (c) Depth of the resistance minima normalized to the normal resistivity (ρN), with the same symbols as in (c) and fitted by fourth order polynomials.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetic pinning of flux lattice in superconducting-nanomagnet hybrids