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4 Feb 2013

Volume 102, Issue 5, Articles (05xxxx)

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Appl. Phys. Lett. 102, 053102 (2013); http://dx.doi.org/10.1063/1.4789442 (5 pages)

P. H. Kim, C. Doolin, B. D. Hauer, A. J. R. MacDonald, M. R. Freeman, P. E. Barclay, and J. P. Davis
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Control of dissipation in superconducting films by magnetic stray fields

A. Gomez, D. A. Gilbert, E. M. Gonzalez, Kai Liu, and J. L. Vicent

Appl. Phys. Lett. 102, 052601 (2013); http://dx.doi.org/10.1063/1.4790846 (4 pages)

Online Publication Date: 5 February 2013

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Hybrid superconducting/magnetic nanostructures on Si substrates have been built with identical physical dimensions but different magnetic configurations. By constructing arrays based on Co-dots with in-plane, out-of-plane, and vortex state magnetic configurations, the stray fields are systematically tuned. Dissipation in the mixed state of superconductors can be decreased (increased) by several orders of magnitude by decreasing (increasing) the stray magnetic fields. Furthermore, ordering of the stray fields over the entire array helps to suppress dissipation and enhance commensurability effects increasing the number of dissipation minima.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.75.Cd Fabrication of magnetic nanostructures
72.15.Gd Galvanomagnetic and other magnetotransport effects
74.25.Op Mixed states, critical fields, and surface sheaths
74.78.Fk Multilayers, superlattices, heterostructures

Measurement of 10 zJ energy dissipation of adiabatic quantum-flux-parametron logic using a superconducting resonator

N. Takeuchi, Y. Yamanashi, and N. Yoshikawa

Appl. Phys. Lett. 102, 052602 (2013); http://dx.doi.org/10.1063/1.4790276 (3 pages)

Online Publication Date: 5 February 2013

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Adiabatic quantum-flux-parametron (AQFP) logic has the potential to operate with an ultimately small bit energy of several zeptojoules; however, this is too small to measure by conventional techniques. We measure such a small energy dissipation by coupling a superconducting resonator with an AQFP gate, where the insertion loss is sensitively varied with the small dissipation due to the very high Q factor of the resonator. We designed and implemented a 5 GHz superconducting resonator coupled with an AQFP gate. Measurement results show that the bit energy of the gate is ∼10 zJ at 5 GHz operation.
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84.30.Sk Pulse and digital circuits
85.25.Hv Superconducting logic elements and memory devices; microelectronic circuits

Current crowding effects in superconducting corner-shaped Al microstrips

O.-A. Adami, D. Cerbu, D. Cabosart, M. Motta, J. Cuppens, W. A. Ortiz, V. V. Moshchalkov, B. Hackens, R. Delamare, J. Van de Vondel, and A. V. Silhanek

Appl. Phys. Lett. 102, 052603 (2013); http://dx.doi.org/10.1063/1.4790625 (4 pages)

Online Publication Date: 6 February 2013

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The superconducting critical current of corner-shaped Al superconducting microstrips has been investigated. We demonstrate that the sharp turns lead to asymmetric vortex dynamics, allowing for easier penetration from the inner concave angle than from the outer convex angle. This effect is evidenced by a rectification of the voltage signal otherwise absent in straight superconducting strips. At low magnetic fields, an enhancement of the critical current with increasing magnetic field is observed for a particular combination of field and current polarity, confirming a theoretically predicted competing interplay of superconducting screening currents and applied currents at the inner side of the turn.
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74.25.Sv Critical currents
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)
74.25.Uv Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses)
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