{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,6]],"date-time":"2026-03-06T22:11:27Z","timestamp":1772835087170,"version":"3.50.1"},"reference-count":10,"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>Low RA MgO magnetic tunnel junctions prepared at Singulus (Ta3\u2215CuN30\u2215Ta5\u2215PtMn20\u2215CoFe2.5\u2215Ru0.7\u2215CoFeB3\u2215MgO1.2\u2215CoFeB3\u2215Ta5 (thickness in nanometers) were microfabricated at INESC-MN. The junctions were patterned into micron-sized sensors (5\u201320\u03bcm2) with controlled shape anisotropy (aspect ratio ranging from 2 to 20). A small external longitudinal bias field (15\u201330 Oe) was further used to improve sensor linearity. The MgO junctions have a resistance-area product of 150\u03a9\u03bcm2 and a maximum tunnel magnetoresistance of 130%. Noise measurements were done in linearized sensors, from dc to 500 kHz. The magnetic and nonmagnetic contributions to the 1\u2215f noise were determined. From the data fitting, Hooge parameters of \u223c2.20\u00d710\u22129\u03bcm2 were obtained for the nonmagnetic 1\u2215f noise. Analysis of direct experimental data revealed the possibility to detect variations of magnetic fields in the order of 10\u221210T\u2215Hz0.5 with these MgO junctions, demonstrating their potential for ultralow-field detection.<\/jats:p>","DOI":"10.1063\/1.2172179","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":63,"title":["1\n                \u2215\n                f\n           noise in linearized low resistance MgO magnetic tunnel junctions"],"prefix":"10.1063","volume":"99","author":[{"given":"J. M.","family":"Almeida","sequence":"first","affiliation":[{"name":"Instituto de Engenharia de Sistemas e Computadores - Microsistemas e Nanotecnologias (INESC-MN) , Lisbon 1000-029, Portugal and , Lisbon 1000-029, Portugal"},{"name":"Instituto Superior T\u00e9cnico (IST) , Lisbon 1000-029, Portugal and , Lisbon 1000-029, Portugal"}]},{"given":"R.","family":"Ferreira","sequence":"additional","affiliation":[{"name":"Instituto de Engenharia de Sistemas e Computadores - Microsistemas e Nanotecnologias (INESC-MN) , Lisbon 1000-029, Portugal and , Lisbon 1000-029, Portugal"},{"name":"Instituto Superior T\u00e9cnico (IST) , Lisbon 1000-029, Portugal and , Lisbon 1000-029, Portugal"}]},{"given":"P. P.","family":"Freitas","sequence":"additional","affiliation":[{"name":"Instituto de Engenharia de Sistemas e Computadores - Microsistemas e Nanotecnologias (INESC-MN) , Lisbon 1000-029, Portugal and , Lisbon 1000-029, Portugal"},{"name":"Instituto Superior T\u00e9cnico (IST) , Lisbon 1000-029, Portugal and , Lisbon 1000-029, Portugal"}]},{"given":"J.","family":"Langer","sequence":"additional","affiliation":[{"name":"Singulus Technologies AG , Hanauer Landstrasse 103, 63796 Kahl\/Main, Germany"}]},{"given":"B.","family":"Ocker","sequence":"additional","affiliation":[{"name":"Singulus Technologies AG , Hanauer Landstrasse 103, 63796 Kahl\/Main, Germany"}]},{"given":"W.","family":"Maass","sequence":"additional","affiliation":[{"name":"Singulus Technologies AG , Hanauer Landstrasse 103, 63796 Kahl\/Main, Germany"}]}],"member":"317","published-online":{"date-parts":[[2006,4,25]]},"reference":[{"key":"2023070101024548100_c1","doi-asserted-by":"publisher","first-page":"2269","DOI":"10.1109\/TMAG.2004.830219","volume":"40","year":"2004","journal-title":"IEEE Trans. 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