Fabrication and optical properties of ultrathin ferromagnet/superconductor metallic bilayers
Ferromagnet/superconductor (F/S) bilayers composed of ultrathin metallic films demonstrate new proximity effects and show a peculiar behavior of the superconductor-order parameter. In terms of applications, F films provide additional "anchoring" of the S film vortex lattice, resulting in i...
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| Veröffentlicht in: | IEEE transactions on applied superconductivity 2005-06, Vol.15 (2), p.2942-2945 |
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| creator | Pepe, G.P. Parlato, L. Latempa, R. D'Acunto, P. Marrocco, N. De Lisio, C. Altucci, C. Peluso, G. Barone, A. Taneda, T. Sobolewski, R. |
| description | Ferromagnet/superconductor (F/S) bilayers composed of ultrathin metallic films demonstrate new proximity effects and show a peculiar behavior of the superconductor-order parameter. In terms of applications, F films provide additional "anchoring" of the S film vortex lattice, resulting in increased critical current. By changing composition and the thickness ratio of the F/S bilayer, one can modify the quasiparticle dynamics through an effective enhancement or suppression of the quasiparticle lifetime under nonequilibrium conditions. The latter effect should lead to "custom-designed" superconducting detectors, with the sensitivity and photoresponse speed tailored to a given application. We present fabrication details of nanometer-thickness NiCu/Nb bilayers of different F/S ratios. The NiCu/Nb structures have been implemented to fabricate Josephson junctions and tested using femtosecond optical spectroscopy. The time-resolved photoresponse experiments allowed us to measure the quasiparticle relaxation dynamics in our bilayers. In addition, the photoresponse temperature dependence studies revealed the spatial evolution of the superconductor-order parameter across the bilayer. Comparison between the bilayer data and the single-material data is also presented. |
| doi_str_mv | 10.1109/TASC.2005.848667 |
| format | Article |
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In terms of applications, F films provide additional "anchoring" of the S film vortex lattice, resulting in increased critical current. By changing composition and the thickness ratio of the F/S bilayer, one can modify the quasiparticle dynamics through an effective enhancement or suppression of the quasiparticle lifetime under nonequilibrium conditions. The latter effect should lead to "custom-designed" superconducting detectors, with the sensitivity and photoresponse speed tailored to a given application. We present fabrication details of nanometer-thickness NiCu/Nb bilayers of different F/S ratios. The NiCu/Nb structures have been implemented to fabricate Josephson junctions and tested using femtosecond optical spectroscopy. The time-resolved photoresponse experiments allowed us to measure the quasiparticle relaxation dynamics in our bilayers. In addition, the photoresponse temperature dependence studies revealed the spatial evolution of the superconductor-order parameter across the bilayer. Comparison between the bilayer data and the single-material data is also presented.</description><identifier>ISSN: 1051-8223</identifier><identifier>EISSN: 1558-2515</identifier><identifier>DOI: 10.1109/TASC.2005.848667</identifier><identifier>CODEN: ITASE9</identifier><language>eng</language><publisher>New York, NY: IEEE</publisher><subject>Applied sciences ; Detectors ; Dynamics ; Electronics ; Exact sciences and technology ; Femtosecond ; Ferromagnetism ; Josephson junctions ; Lattices ; Niobium ; Non-equilibrium processes in superconductors ; Optical device fabrication ; Optical films ; Optical sensors ; Optical vortices ; Proximity effect ; proximity ferromagnet/superconductor bilayers ; pump-probe measurements ; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices ; Superconducting devices ; Superconducting films ; Superconductivity ; Superconductors ; Temperature dependence ; Ultrafast optics ; ultrathin superconducting films</subject><ispartof>IEEE transactions on applied superconductivity, 2005-06, Vol.15 (2), p.2942-2945</ispartof><rights>2005 INIST-CNRS</rights><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 2005</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c415t-5b82f73c740cc6dad723ebadacda70b8d75fd30d0d807283ccc0bd4230ffa33a3</citedby><cites>FETCH-LOGICAL-c415t-5b82f73c740cc6dad723ebadacda70b8d75fd30d0d807283ccc0bd4230ffa33a3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/1440285$$EHTML$$P50$$Gieee$$H</linktohtml><link.rule.ids>309,310,314,776,780,785,786,792,23909,23910,25118,27901,27902,54733</link.rule.ids><linktorsrc>$$Uhttps://ieeexplore.ieee.org/document/1440285$$EView_record_in_IEEE$$FView_record_in_$$GIEEE</linktorsrc><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=16924427$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Pepe, G.P.</creatorcontrib><creatorcontrib>Parlato, L.</creatorcontrib><creatorcontrib>Latempa, R.</creatorcontrib><creatorcontrib>D'Acunto, P.</creatorcontrib><creatorcontrib>Marrocco, N.</creatorcontrib><creatorcontrib>De Lisio, C.</creatorcontrib><creatorcontrib>Altucci, C.</creatorcontrib><creatorcontrib>Peluso, G.</creatorcontrib><creatorcontrib>Barone, A.</creatorcontrib><creatorcontrib>Taneda, T.</creatorcontrib><creatorcontrib>Sobolewski, R.</creatorcontrib><title>Fabrication and optical properties of ultrathin ferromagnet/superconductor metallic bilayers</title><title>IEEE transactions on applied superconductivity</title><addtitle>TASC</addtitle><description>Ferromagnet/superconductor (F/S) bilayers composed of ultrathin metallic films demonstrate new proximity effects and show a peculiar behavior of the superconductor-order parameter. In terms of applications, F films provide additional "anchoring" of the S film vortex lattice, resulting in increased critical current. By changing composition and the thickness ratio of the F/S bilayer, one can modify the quasiparticle dynamics through an effective enhancement or suppression of the quasiparticle lifetime under nonequilibrium conditions. The latter effect should lead to "custom-designed" superconducting detectors, with the sensitivity and photoresponse speed tailored to a given application. We present fabrication details of nanometer-thickness NiCu/Nb bilayers of different F/S ratios. The NiCu/Nb structures have been implemented to fabricate Josephson junctions and tested using femtosecond optical spectroscopy. The time-resolved photoresponse experiments allowed us to measure the quasiparticle relaxation dynamics in our bilayers. In addition, the photoresponse temperature dependence studies revealed the spatial evolution of the superconductor-order parameter across the bilayer. Comparison between the bilayer data and the single-material data is also presented.</description><subject>Applied sciences</subject><subject>Detectors</subject><subject>Dynamics</subject><subject>Electronics</subject><subject>Exact sciences and technology</subject><subject>Femtosecond</subject><subject>Ferromagnetism</subject><subject>Josephson junctions</subject><subject>Lattices</subject><subject>Niobium</subject><subject>Non-equilibrium processes in superconductors</subject><subject>Optical device fabrication</subject><subject>Optical films</subject><subject>Optical sensors</subject><subject>Optical vortices</subject><subject>Proximity effect</subject><subject>proximity ferromagnet/superconductor bilayers</subject><subject>pump-probe measurements</subject><subject>Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices</subject><subject>Superconducting devices</subject><subject>Superconducting films</subject><subject>Superconductivity</subject><subject>Superconductors</subject><subject>Temperature dependence</subject><subject>Ultrafast optics</subject><subject>ultrathin superconducting films</subject><issn>1051-8223</issn><issn>1558-2515</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNqN0c9LHTEQB_ClVKjV3gu9LEJLL_uc_Npkj_KoVRA8qDchzOZHjezbPJPswf_ePJ4geCiekpDPDDN8m-Y7gRUhMJzent2sVxRArBRXfS8_NYdECNVRQcTnegdBOkUp-9J8zfkRgHDFxWFzf45jCgZLiHOLs23jttTn1G5T3LpUgstt9O0ylYTlIcytdynFDf6bXTnNSyUmznYxJaZ24wpOUzDtGCZ8dikfNwcep-y-vZ5Hzd35n9v1RXd1_fdyfXbVGU5E6cSoqJfMSA7G9BatpMyNaNFYlDAqK4W3DCxYBZIqZoyB0XLKwHtkDNlR82vftw79tLhc9CZk46YJZxeXrKmiSsDQfwACEwOHCn__F5JeEsYHwUilJ-_oY1zSXPfVA6GgJAFVEeyRSTHn5LzeprDB9KwJ6F1-epef3uWn9_nVkp-vfTHXQHzC2YT8VtcPlHO6cz_2Ljjn3r45h7o0ewFzTaUq</recordid><startdate>20050601</startdate><enddate>20050601</enddate><creator>Pepe, G.P.</creator><creator>Parlato, L.</creator><creator>Latempa, R.</creator><creator>D'Acunto, P.</creator><creator>Marrocco, N.</creator><creator>De Lisio, C.</creator><creator>Altucci, C.</creator><creator>Peluso, G.</creator><creator>Barone, A.</creator><creator>Taneda, T.</creator><creator>Sobolewski, R.</creator><general>IEEE</general><general>Institute of Electrical and Electronics Engineers</general><general>The Institute of Electrical and Electronics Engineers, Inc. (IEEE)</general><scope>97E</scope><scope>RIA</scope><scope>RIE</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7U5</scope><scope>8FD</scope><scope>L7M</scope><scope>F28</scope><scope>FR3</scope><scope>H8D</scope></search><sort><creationdate>20050601</creationdate><title>Fabrication and optical properties of ultrathin ferromagnet/superconductor metallic bilayers</title><author>Pepe, G.P. ; Parlato, L. ; Latempa, R. ; D'Acunto, P. ; Marrocco, N. ; De Lisio, C. ; Altucci, C. ; Peluso, G. ; Barone, A. ; Taneda, T. ; Sobolewski, R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c415t-5b82f73c740cc6dad723ebadacda70b8d75fd30d0d807283ccc0bd4230ffa33a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2005</creationdate><topic>Applied sciences</topic><topic>Detectors</topic><topic>Dynamics</topic><topic>Electronics</topic><topic>Exact sciences and technology</topic><topic>Femtosecond</topic><topic>Ferromagnetism</topic><topic>Josephson junctions</topic><topic>Lattices</topic><topic>Niobium</topic><topic>Non-equilibrium processes in superconductors</topic><topic>Optical device fabrication</topic><topic>Optical films</topic><topic>Optical sensors</topic><topic>Optical vortices</topic><topic>Proximity effect</topic><topic>proximity ferromagnet/superconductor bilayers</topic><topic>pump-probe measurements</topic><topic>Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices</topic><topic>Superconducting devices</topic><topic>Superconducting films</topic><topic>Superconductivity</topic><topic>Superconductors</topic><topic>Temperature dependence</topic><topic>Ultrafast optics</topic><topic>ultrathin superconducting films</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Pepe, G.P.</creatorcontrib><creatorcontrib>Parlato, L.</creatorcontrib><creatorcontrib>Latempa, R.</creatorcontrib><creatorcontrib>D'Acunto, P.</creatorcontrib><creatorcontrib>Marrocco, N.</creatorcontrib><creatorcontrib>De Lisio, C.</creatorcontrib><creatorcontrib>Altucci, C.</creatorcontrib><creatorcontrib>Peluso, G.</creatorcontrib><creatorcontrib>Barone, A.</creatorcontrib><creatorcontrib>Taneda, T.</creatorcontrib><creatorcontrib>Sobolewski, R.</creatorcontrib><collection>IEEE All-Society Periodicals Package (ASPP) 2005–Present</collection><collection>IEEE All-Society Periodicals Package (ASPP) 1998-Present</collection><collection>IEEE Electronic Library (IEL)</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><jtitle>IEEE transactions on applied superconductivity</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Pepe, G.P.</au><au>Parlato, L.</au><au>Latempa, R.</au><au>D'Acunto, P.</au><au>Marrocco, N.</au><au>De Lisio, C.</au><au>Altucci, C.</au><au>Peluso, G.</au><au>Barone, A.</au><au>Taneda, T.</au><au>Sobolewski, R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Fabrication and optical properties of ultrathin ferromagnet/superconductor metallic bilayers</atitle><jtitle>IEEE transactions on applied superconductivity</jtitle><stitle>TASC</stitle><date>2005-06-01</date><risdate>2005</risdate><volume>15</volume><issue>2</issue><spage>2942</spage><epage>2945</epage><pages>2942-2945</pages><issn>1051-8223</issn><eissn>1558-2515</eissn><coden>ITASE9</coden><abstract>Ferromagnet/superconductor (F/S) bilayers composed of ultrathin metallic films demonstrate new proximity effects and show a peculiar behavior of the superconductor-order parameter. In terms of applications, F films provide additional "anchoring" of the S film vortex lattice, resulting in increased critical current. By changing composition and the thickness ratio of the F/S bilayer, one can modify the quasiparticle dynamics through an effective enhancement or suppression of the quasiparticle lifetime under nonequilibrium conditions. The latter effect should lead to "custom-designed" superconducting detectors, with the sensitivity and photoresponse speed tailored to a given application. We present fabrication details of nanometer-thickness NiCu/Nb bilayers of different F/S ratios. The NiCu/Nb structures have been implemented to fabricate Josephson junctions and tested using femtosecond optical spectroscopy. The time-resolved photoresponse experiments allowed us to measure the quasiparticle relaxation dynamics in our bilayers. In addition, the photoresponse temperature dependence studies revealed the spatial evolution of the superconductor-order parameter across the bilayer. Comparison between the bilayer data and the single-material data is also presented.</abstract><cop>New York, NY</cop><pub>IEEE</pub><doi>10.1109/TASC.2005.848667</doi><tpages>4</tpages></addata></record> |
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| language | eng |
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| subjects | Applied sciences Detectors Dynamics Electronics Exact sciences and technology Femtosecond Ferromagnetism Josephson junctions Lattices Niobium Non-equilibrium processes in superconductors Optical device fabrication Optical films Optical sensors Optical vortices Proximity effect proximity ferromagnet/superconductor bilayers pump-probe measurements Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Superconducting devices Superconducting films Superconductivity Superconductors Temperature dependence Ultrafast optics ultrathin superconducting films |
| title | Fabrication and optical properties of ultrathin ferromagnet/superconductor metallic bilayers |
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