{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,21]],"date-time":"2025-09-21T17:09:11Z","timestamp":1758474551807,"version":"3.41.2"},"reference-count":11,"publisher":"AIP Publishing","issue":"8","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2006,4,15]]},"abstract":"<jats:p>Magnetic tunnel junctions (MTJs) with partially oxidized 9 \u00c5 AlOx barriers were recently shown to have the characteristics needed for magnetoresistive sensors in high-density storage devices (tunneling magnetoresistance \u223c20%; RA\u223c0.5\u03a9\u03bcm2). Here we study the electrical transport in such low-resistance, underoxidized magnetic tunnel junctions. Under a low bias current, the tunnel magnetoresistance ratio reveals jumps between two closely separated levels, an effect associated with spin dependent transport through localized defects in the insulating barrier. We further show that dielectric breakdown at high applied electrical current is of an extrinsic nature. Temperature-dependent measurements of the electrical resistance (R) of MTJs (300-20 K) with extremely small oxidation times reveal a metallic-like behavior (dR\u2215dT&amp;gt;0), although a large magnetoresistive ratio is still observed (16% at T=300K and 28% at T=20K).<\/jats:p>","DOI":"10.1063\/1.2150428","type":"journal-article","created":{"date-parts":[[2006,6,12]],"date-time":"2006-06-12T16:13:20Z","timestamp":1150128800000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":7,"title":["Spin-dependent two-level resistance fluctuations in underoxidized tunnel junctions"],"prefix":"10.1063","volume":"99","author":[{"given":"J.","family":"Ventura","sequence":"first","affiliation":[{"name":"IFIMUP and DFFCUP , Rua do Campo Alegre, 678, 4169-007, Porto, Portugal"}]},{"given":"J.","family":"Teixeira","sequence":"additional","affiliation":[{"name":"IFIMUP and DFFCUP , Rua do Campo Alegre, 678, 4169-007, Porto, Portugal"}]},{"given":"Yu. G.","family":"Pogorelov","sequence":"additional","affiliation":[{"name":"IFIMUP and DFFCUP , Rua do Campo Alegre, 678, 4169-007, Porto, Portugal"}]},{"given":"J. B.","family":"Sousa","sequence":"additional","affiliation":[{"name":"IFIMUP and DFFCUP , Rua do Campo Alegre, 678, 4169-007, Porto, Portugal"}]},{"given":"R.","family":"Ferreira","sequence":"additional","affiliation":[{"name":"INESC-MN and IST , Rua Alves Redol, 9-1, 1000-029 Lisbon, Portugal"}]},{"given":"P. P.","family":"Freitas","sequence":"additional","affiliation":[{"name":"INESC-MN and IST , Rua Alves Redol, 9-1, 1000-029 Lisbon, Portugal"}]}],"member":"317","published-online":{"date-parts":[[2006,4,17]]},"reference":[{"key":"2023062506261972400_c1","doi-asserted-by":"publisher","first-page":"192502","DOI":"10.1063\/1.1925318","volume":"86","year":"2005","journal-title":"Appl. Phys. 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Magn."}],"container-title":["Journal of Applied Physics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/pubs.aip.org\/aip\/jap\/article-pdf\/doi\/10.1063\/1.2150428\/14966481\/08t301_1_online.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/pubs.aip.org\/aip\/jap\/article-pdf\/doi\/10.1063\/1.2150428\/14966481\/08t301_1_online.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,6,25]],"date-time":"2023-06-25T09:21:29Z","timestamp":1687684889000},"score":1,"resource":{"primary":{"URL":"https:\/\/pubs.aip.org\/jap\/article\/99\/8\/08T301\/177798\/Spin-dependent-two-level-resistance-fluctuations"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2006,4,15]]},"references-count":11,"journal-issue":{"issue":"8","published-print":{"date-parts":[[2006,4,15]]}},"URL":"https:\/\/doi.org\/10.1063\/1.2150428","relation":{},"ISSN":["0021-8979","1089-7550"],"issn-type":[{"type":"print","value":"0021-8979"},{"type":"electronic","value":"1089-7550"}],"subject":[],"published-other":{"date-parts":[[2006,4,15]]},"published":{"date-parts":[[2006,4,15]]},"article-number":"08T301"}}