{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,27]],"date-time":"2025-10-27T20:31:13Z","timestamp":1761597073752,"version":"3.41.2"},"reference-count":8,"publisher":"AIP Publishing","issue":"7","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2008,4,1]]},"abstract":"<jats:p>Single and double barrier MgO based magnetic tunnel junction sensors were processed with area of 200\u03bcm2 and small aspect ratios (&amp;lt;2). These sensors present resistance area products ranging from 10to70k\u03a9\u03bcm2 and tunneling magnetoresistance (TMR) values of up to 160%. Sensor linearization was mostly obtained by thinning the CoFeB free layer to 15.5A, close to the free layer transition from ferromagnetic to superparamagnetic behavior. Three different thicknesses were studied for the free layer CoFeB: 1.55, 1.8, and 3nm. The CoFeB thickness decrease required for the linearization implies a loss in TMR. Field detection range of \u223c80pT\u2215Hz0.5 was obtained for both double and single barrier sensors (at 500KHz). Out of the 1\u2215f regime, the detection range decreases to \u223c2pT\u2215Hz0.5 for the single barrier sensor. The field detection dependence on bias voltage was also studied at 500KHz and outside the 1\u2215f dominated regime.<\/jats:p>","DOI":"10.1063\/1.2836721","type":"journal-article","created":{"date-parts":[[2008,3,11]],"date-time":"2008-03-11T08:53:08Z","timestamp":1205225588000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":29,"title":["Field detection in single and double barrier MgO magnetic tunnel junction sensors"],"prefix":"10.1063","volume":"103","author":[{"given":"J. M.","family":"Almeida","sequence":"first","affiliation":[{"name":"Instituto de Engenharia de Sistemas e Computadores-Microsistemas e Nanotecnologias (INESC-MN) , Lisbon, Portugal and , Physics Department (IST), Lisbon, Portugal"},{"name":"Instituto Superior T\u00e9cnico , Lisbon, Portugal and , Physics Department (IST), Lisbon, Portugal"}]},{"given":"P.","family":"Wisniowski","sequence":"additional","affiliation":[{"name":"Instituto de Engenharia de Sistemas e Computadores-Microsistemas e Nanotecnologias (INESC-MN) , Lisbon, Portugal and , Physics Department (IST), Lisbon, Portugal"},{"name":"Instituto Superior T\u00e9cnico , Lisbon, Portugal and , Physics Department (IST), Lisbon, Portugal"}]},{"given":"P. P.","family":"Freitas","sequence":"additional","affiliation":[{"name":"Instituto de Engenharia de Sistemas e Computadores-Microsistemas e Nanotecnologias (INESC-MN) , Lisbon, Portugal and , Physics Department (IST), Lisbon, Portugal"},{"name":"Instituto Superior T\u00e9cnico , Lisbon, Portugal and , Physics Department (IST), Lisbon, Portugal"}]}],"member":"317","published-online":{"date-parts":[[2008,3,10]]},"reference":[{"key":"2023070319560983600_c1","doi-asserted-by":"publisher","first-page":"862","DOI":"10.1038\/nmat1256","volume":"3","year":"2004","journal-title":"Nat. Mater."},{"key":"2023070319560983600_c2","doi-asserted-by":"publisher","first-page":"868","DOI":"10.1038\/nmat1257","volume":"3","year":"2004","journal-title":"Nat. Mater."},{"key":"2023070319560983600_c3","doi-asserted-by":"publisher","first-page":"163119","DOI":"10.1063\/1.2370876","volume":"89","year":"2006","journal-title":"Appl. Phys. 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