| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Lang, Wolfgang
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (24/24 displayed)
- 2023Phase purity and surface morphology of high-Jc superconducting Bi2Sr2Ca1Cu2O8+δ thin filmscitations
- 2023Angle-dependent Magnetoresistance of an Ordered Bose Glass of Vortices in YBa2Cu3O7-δ Thin Films with a Periodic Pinning Latticecitations
- 2023Applied Surface Science / Phase purity and surface morphology of high-Jc superconducting Bi2Sr2Ca1Cu2O8+δ thin filmscitations
- 2020Angular magnetic-field dependence of vortex matching in pinning lattices fabricated by focused or masked helium ion beam irradiation of superconducting YBa2Cu3O7-δ thin filmscitations
- 2018Transverse vortex commensurability effect and sign change of the Hall voltage in superconducting YBa2Cu3O7−δ thin films with a nanoscale periodic pinning landscapecitations
- 2017Superconducting order parameter fluctuations in NbN/NiCu and NbTiN/NiCu bilayer nanostripes for photon detectioncitations
- 2015Superconducting and ferromagnetic properties of NbN/NiCu and NbTiN/NiCu bilayer nanostructures for photon detectioncitations
- 2014Strong vortex matching effects in YBCO films with periodic modulations of the superconducting order parameter fabricated by masked ion irradiationcitations
- 2012Ion beam irradiation of cuprate high-temperature superconductors: Systematic modification of the electrical properties and fabrication of nanopatternscitations
- 2012Non-ohmic electrical transport properties above the critical temperature in optimally and underdoped superconducting YBa2Cu3O6+xcitations
- 2010Optically induced changes and long-term relaxations of resistivity and critical temperature in He+ irradiated YBa2Cu3Oxcitations
- 2010Surface planarization and masked ion-beam structuring of YBa2Cu3O7 thin filmscitations
- 2010Modification and nano-patterning of high-Tc superconducting thin films by masked ion beam irradiationcitations
- 2009Masked ion beam irradiation of high-temperature superconductors: patterning of nano-size regions with high point-defect densitycitations
- 2008Photodoping of YBa2Cu3Ox: Dependence on temperature and photon energycitations
- 2006Ion-beam modification of high-temperature superconductor thin films for the fabrication of superconductive nanodevices
- 2006Non-exponential optical modification of the electrical properties in oxygen-deficient YBa2Cu3Ox
- 2006Angle dependence of the Hall effect in HgBa2 CaCu2 O6 thin filmscitations
- 2006Ion-beam direct-structuring of high-temperature superconductorscitations
- 2006Angle-dependence of the Hall effect in Hg-Ba-Ca-Cu-O thin films
- 2004Tailoring the transport properties of YBa2Cu3O7-δ thin films by light-ion irradiation
- 2002Electrical properties, texture, and microstructure of vicinal YBa2Cu3O7-δ thin filmscitations
- 2001Pulsed-laser deposition and characterization of high-temperature superconducting films
- 2000Double sign reversal of the vortex Hall effect in YBa2Cu3O7-δ thin films in the strong pinning limit of low magnetic fieldscitations
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document
Superconducting and ferromagnetic properties of NbN/NiCu and NbTiN/NiCu bilayer nanostructures for photon detection
Abstract
<p>Performance of superconducting single-photon detectors based on resistive hotspot formation in nanostripes upon optical photon absorption depends strongly on the critical current density JC of the fabricated nanostructure. Utilization of an ultrathin, weak-ferromagnet cap layer on the top of a superconducting film enhances of the structure€™s JC due to an extra flux pinning. We have fabricated a number of both NbN/NiCu and NbTiN/NiCu superconductor/ferromagnet (S/F) ultrathin bilayers and microbridges. NbN and NbTiN underlayers with thicknesses varying from 4 to 7 nm were grown using dc-magnetron sputtering on chemically cleaned sapphire single-crystal substrates. After rapid thermal annealing at high temperatures, the S films were coated with Ni0.54Cu0.46 overlayers with thicknesses of about 6 nm, using cosputtering. Compositions of the deposited films were confirmed by EDX spectroscopy analysis, while TEM studies demonstrated excellent epitaxial quality of our S layers with ∼2-nm-thick F/S transition layer and atomically-sharp S/substrate interface. Magnetic properties of bilayers were studied using both the SQUID and Vibrating Sample Magnetometer techniques in low and high magnetic fields. Low-temperature tests confirmed that in all cases NiCu films were ferromagnetic with the Curie temperature of above 30 K. Below the bilayer critical temperature of approx. 12-13 K, the structures were fully proximitized with the strong superconducting signal. For superconducting transport properties characterization, we used bilayers patterned into 40-1/4m-long microbridges with the width varying from 0.4 1/4m to 2 1/4m. The same S/F nanostructures were also used to study their superconducting fluctuations. The temperature dependence of magnetoresistance demonstrated highly 2-dimensional character with an unusual negative region that extended almost to room temperature. In the S/F sample, the fluctuations were observed to be substantially below theoretical expectations.</p>