Observation of magnetic flux pinning in a thin Nb film with a square lattice of nickel dots

Terentiev, A.N.; Watkins, D. B.; Long, L. E. De; Morgan, D. O.; Ketterson, J. B.

doi:10.1016/s0921-4534(99)00452-9

Cited by 21 publications

(21 citation statements)

References 19 publications

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“…The superconducting properties of the hybrid structures have been characterized either by; transport measurements (magnetoresistance, critical current and current voltage characteristics) [25,53], DC magnetization [30,51], AC susceptibility [54], or imaging techniques such as scanning Hall probe microscopy [42] and Lorentz microscopy [15]. Fig.…”

Section: Fabrication Of Hybrid Superconducting/magnetic Nanostructuresmentioning

confidence: 99%

Superconducting vortex pinning with artificial magnetic nanostructures

Vélez

Martín

Villegas

et al. 2008

Journal of Magnetism and Magnetic Materials

200

180

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Section: Fabrication Of Hybrid Superconducting/magnetic Nanostructuresmentioning

confidence: 99%

Superconducting vortex pinning with artificial magnetic nanostructures

Vélez

Martín

Villegas

et al. 2008

Journal of Magnetism and Magnetic Materials

200

180

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“…These arrays can be fabricated using nano-lithography techniques in which periodic arrangements of micro-holes [1][2][3][4][5][6][7][8][9][10][11][12] or magnetic dots [13][14][15][16][17][18][19] of various geometries can be constructed. A more recent technique is the use of Bitter decoration where the magnetic particles used for the initial decoration can act as well ordered arrays of pinning [15].…”

Section: Introductionmentioning

confidence: 99%

Complex dynamical flow phases and pinning in superconductors with rectangular pinning arrays

2001

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We examine vortex pinning and dynamics in thin-film superconductors interacting with square and rectangular pinning arrays for varied vortex densities including densities significantly larger than the pinning density. For both square and rectangular pinning arrays, the critical depinning force shows maxima at only certain integer matching fields where the vortices can form highly ordered arrays. For rectangular arrays the depinning force and commensurability effects are anisotropic with a much lower depinning threshold for vortex motion in the easy flow directions. We find evidence for a crossover in pinning behavior in rectangular pinning arrays as the field is increased. We also show analytically, and confirm with simulations, that for B = 2B φ the strongest pinning can be achieved for rectangular pinning arrangements rather than square for one direction of driving force. Under an applied driving force we find a remarkable variety of distinct complex flow phases in both square and rectangular arrays. These flow phases include stable sinusoidal and intricate pinched patterns where vortices from different channels do not mix. As a function of the driving force certain flow states become unstable and transitions between different phases are observed which coincide with changes in the net vortex velocities. In the rectangular arrays the types of flow depend on the direction of drive. We also show that two general types of plastic flow occur: stable flows, where vortices always flow along the same paths, and unstable or chaotic flows.

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“…1-3 Lattices of antidots ͑holes͒, [3][4][5] or dots of normal 6,7 or magnetic [6][7][8][9][10][11] metals are known to greatly enhance the low-field critical current density J c (H), as well as provide different opportunities to precisely control flux pinning and flow, as desired in practical applications of superconducting films. 12 The magnetization and electrical resistivity of patterned films are of particular interest, since they exhibit strong anomalies when the temperature is very close to the critical temperature T c and the perpendicular applied field is very near a ''matching field'' H n , at which the equilibrium number of Abrikosov flux lines ͑FL's͒ ͑expected to penetrate an unpatterned film in the mixed state͒ is an integral multiple n of the number of APC.…”

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Periodic magnetization instabilities in a superconducting Nb film with a square lattice of Ni dots

et al. 2000

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Isothermal magnetization curves of a superconducting Nb film perforated by a square lattice of Ni dots exhibit quasiperiodic instabilities below ϳ4 K, with a field-dependent period equal to the first, second, or third matching fields. The instabilities are found in a range of applied fields well above the saturation matching value, and under conditions where a continuous Nb film with the same dimensions and magnetization remained stable. The results suggest that terraces of matched flux density exist at the border of a flux-depleted zone created by a geometric barrier near the film edge. Geometric effects may thus play an important role in determining the presence or absence of matching effects. RAPID COMMUNICATIONS R9250PRB 61 A. TERENTIEV et al. RAPID COMMUNICATIONS PRB 61 R9251 PERIODIC MAGNETIZATION INSTABILITIES IN A . . . RAPID COMMUNICATIONS R9252PRB 61 A. TERENTIEV et al.

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Observation of magnetic flux pinning in a thin Nb film with a square lattice of nickel dots

Cited by 21 publications

References 19 publications

Superconducting vortex pinning with artificial magnetic nanostructures

Superconducting vortex pinning with artificial magnetic nanostructures

Complex dynamical flow phases and pinning in superconductors with rectangular pinning arrays

Periodic magnetization instabilities in a superconducting Nb film with a square lattice of Ni dots

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