{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,1]],"date-time":"2025-11-01T21:27:57Z","timestamp":1762032477578},"reference-count":10,"publisher":"AIP Publishing","issue":"7","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2004,10,1]]},"abstract":"<jats:p>We study CoFe\u2215Al2O3 multilayers, varying from granular to continuous structure with CoFe nominal thickness (10\u00c5\u2a7dt\u2a7d18\u00c5). Structural percolation takes place at t=tc\u224818\u00c5, changing from activated to metallic conductance. A sharp anomaly in ac coercivity of magneto-optical Kerr effect and in magnetization M by superconducting quantum interferometer device is found at t=t*\u224817\u00c5, interpreted as transition from superferromagnetism (by dipolar coupled CoFe clusters) to exchange ferromagnetism. Onset at t=t* of anisotropic magnetoresistance (AMR) is attributed to skew scattering of bandlike electrons within giant fractal clusters. These structures may cause the observed Barkhausen noises in M and AMR at t\u2248t*, disappearing at t&amp;gt;t*.<\/jats:p>","DOI":"10.1063\/1.1786651","type":"journal-article","created":{"date-parts":[[2004,9,27]],"date-time":"2004-09-27T22:03:00Z","timestamp":1096322580000},"page":"3861-3864","update-policy":"http:\/\/dx.doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":19,"title":["Peculiar magnetic and electrical properties near structural percolation in metal-insulator granular layers"],"prefix":"10.1063","volume":"96","author":[{"given":"J. B.","family":"Sousa","sequence":"first","affiliation":[{"name":"IFIMUP and Physics Department , FCUP, R. Campo Alegre, 687, Porto 4169, Portugal"}]},{"given":"J. A. 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