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13 Aug 2012

Volume 101, Issue 7, Articles (07xxxx)

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Appl. Phys. Lett. 101, 071104 (2012); http://dx.doi.org/10.1063/1.4742749 (4 pages)

Judson D. Ryckman and S. M. Weiss
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Bias-current effect on inverse spin-switch effect in Permalloy/Nb/Permalloy pseudo spin-valves

Tae-Jong Hwang and D. H. Kim

Appl. Phys. Lett. 101, 072601 (2012); http://dx.doi.org/10.1063/1.4745610 (4 pages)

Online Publication Date: 14 August 2012

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The magnetoresistance of Permalloy/Nb/Permalloy pseudo spin-valves in the superconducting transition region have been measured in sweeping magnetic fields while varying bias current in order to investigate bias-current effect on the inverse spin-switch behavior. The magnetoresistance measured between two notches in a micron-size bar showed an ideal inverse spin-switch effect between two magnetic states of Permalloy layers, parallel and antiparallel domain state, at high enough bias-current densities exceeding 105 A/cm2, in which the antiparallel domain state returns to the normal whereas the parallel state remains superconducting.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
74.20.Mn Nonconventional mechanisms
75.47.De Giant magnetoresistance
75.60.Ch Domain walls and domain structure

Photon-number resolving detector based on a series array of superconducting nanowires

S. Jahanmirinejad, G. Frucci, F. Mattioli, D. Sahin, A. Gaggero, R. Leoni, and A. Fiore

Appl. Phys. Lett. 101, 072602 (2012); http://dx.doi.org/10.1063/1.4746248 (4 pages) | Cited 3 times

Online Publication Date: 14 August 2012

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We present the experimental demonstration of a superconducting photon number resolving detector. It is based on the series connection of N superconducting nanowires, each connected in parallel to an integrated resistor. The device provides a single voltage readout, proportional to the number of photons detected in distinct nanowires. Clearly separated output levels corresponding to the detection of n = 1−4 photons are observed in a 4-element detector fabricated from an NbN film on GaAs substrate, with a single-photon system quantum efficiency of 2.6% at λ = 1.3 μm. The series-nanowire structure is promising in view of its scalability to large photon numbers and high efficiencies.
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07.60.Dq Photometers, radiometers, and colorimeters
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
07.57.-c Infrared, submillimeter wave, microwave and radiowave instruments and equipment
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