{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,1]],"date-time":"2026-04-01T12:14:03Z","timestamp":1775045643120,"version":"3.50.1"},"reference-count":44,"publisher":"AIP Publishing","issue":"11","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2009,12,1]]},"abstract":"<jats:p>The magnetic and transport properties of Co80Fe20(t)\/Al2O3(4\u2002nm) multilayers with low nominal thicknesses t=0.7 and 0.9 nm of Co80Fe20 granular layers are studied. Magnetic studies find a superparamagnetic state above the blocking temperature Tb (of field-cooled\/zero-field-cooled splitting) that grows with t and decreases with H. The low-voltage Ohmic tunnel transport passes to non-Ohmic I\u221dV3\/2 law for applied fields above \u223c500\u2002V\/cm. At fixed V, the temperature dependence of conductance reveals an anomalous dip around \u223c220\u2002K, which can be attributed to the effect of surface contamination by supercooled water. Current-in-plane tunnel magnetoresistance (MR) ratio tends, at lower t, to higher maximum values (\u223c8% at room temperature) but to lower field sensitivity. This may indicate growing discorrelation effect (e.g., between shrinking areas of correlated moments) in this regime and corroborates the deficit of granule magnetization estimated from the Inoue\u2013Maekawa MR fit, compared to that from direct magnetization measurements. MR displays a mean-field-like critical behavior when t approaches the point of superparamagnetic\/superferromagnetic transition (tc\u223c1.3\u2002nm at room temperature) from below, different from the formerly reported percolationlike behavior at approaching it from above. With growing temperature, MR reveals, beyond the common decrease, an anomalous plateau from Tb\u223c30\u201350\u2002K up to some higher value T\u2217\u223c150\u2013200\u2002K, not seen at higher t.<\/jats:p>","DOI":"10.1063\/1.3266010","type":"journal-article","created":{"date-parts":[[2009,12,5]],"date-time":"2009-12-05T00:01:32Z","timestamp":1259971292000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":5,"title":["Magnetic and transport properties of diluted granular multilayers"],"prefix":"10.1063","volume":"106","author":[{"given":"H. G.","family":"Silva","sequence":"first","affiliation":[{"name":"Universidade do Algarve 1 Center of Electronic Optoelectronics and Telecommunications (CEOT), , Campus de Gambelas, 8005-139 Faro, Portugal"},{"name":"Universidade do Porto 2 IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Departamento de F\u00edsica, Faculdade de Ci\u00eancias, , Rua do Campo Alegre, 687, 4169-007 Porto, Portugal"}]},{"given":"H. L.","family":"Gomes","sequence":"additional","affiliation":[{"name":"Universidade do Algarve 1 Center of Electronic Optoelectronics and Telecommunications (CEOT), , Campus de Gambelas, 8005-139 Faro, Portugal"}]},{"given":"Y. G.","family":"Pogorelov","sequence":"additional","affiliation":[{"name":"Universidade do Porto 2 IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Departamento de F\u00edsica, Faculdade de Ci\u00eancias, , Rua do Campo Alegre, 687, 4169-007 Porto, Portugal"}]},{"given":"L. M. C.","family":"Pereira","sequence":"additional","affiliation":[{"name":"Universidade do Porto 2 IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Departamento de F\u00edsica, Faculdade de Ci\u00eancias, , Rua do Campo Alegre, 687, 4169-007 Porto, Portugal"}]},{"given":"G. N.","family":"Kakazei","sequence":"additional","affiliation":[{"name":"Universidade do Porto 2 IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Departamento de F\u00edsica, Faculdade de Ci\u00eancias, , Rua do Campo Alegre, 687, 4169-007 Porto, Portugal"},{"name":"National Academy of Sciences of Ukraine 3 Institute of Magnetism, , 36 b Vernadskogo Blvd., 03142 Kiev, Ukraine"}]},{"given":"J. B.","family":"Sousa","sequence":"additional","affiliation":[{"name":"Universidade do Porto 2 IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Departamento de F\u00edsica, Faculdade de Ci\u00eancias, , Rua do Campo Alegre, 687, 4169-007 Porto, Portugal"}]},{"given":"J. P.","family":"Ara\u00fajo","sequence":"additional","affiliation":[{"name":"Universidade do Porto 2 IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Departamento de F\u00edsica, Faculdade de Ci\u00eancias, , Rua do Campo Alegre, 687, 4169-007 Porto, Portugal"}]},{"given":"J. F. L.","family":"Mariano","sequence":"additional","affiliation":[{"name":"Universidade do Algarve 4 Departamento de F\u00edsica, , Campus de Gambelas, 8005-139 Faro, Portugal"}]},{"given":"S.","family":"Cardoso","sequence":"additional","affiliation":[{"name":"INESC-MN 5 and , Rua Alves Redol, 9-1, 1000-029 Lisboa, Portugal"},{"name":"IN-Institute of Nanoscience and Nanotechnology 5 and , Rua Alves Redol, 9-1, 1000-029 Lisboa, Portugal"}]},{"given":"P. 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