{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,12]],"date-time":"2026-04-12T01:29:59Z","timestamp":1775957399669,"version":"3.50.1"},"reference-count":21,"publisher":"AIP Publishing","issue":"11","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2007,6,1]]},"abstract":"<jats:p>Specular spin valves show enhanced giant magnetoresistive (GMR) ratio when compared to other, simpler, spin valve structures. The enhancement of GMR results from specular reflection in nano-oxide layers (NOLs) formed by the partial oxidation of the pinned and free layer. These oxides forming the NOL order antiferromagnetically (AFM) below a temperature T\u223c175\u2009K. Here, we study the effects of the pinned layer magnetization and its domain structure on the AFM ordering of the NOL by performing field cooling measurements with different cooling fields (H0). We observe enhanced (reduced) exchange field and magnetoresistive ratio for H0&amp;gt;0(&amp;lt;0), i.e., parallel (antiparallel) to the pinned magnetization. These measurements allowed us to confirm the existence of a wide distribution of blocking temperatures (TB) in the NOL of specular spin valves, having a maximum at T\u2248175\u2009K, and extending to NOL regions with TB as low as 15 K.<\/jats:p>","DOI":"10.1063\/1.2736290","type":"journal-article","created":{"date-parts":[[2007,6,1]],"date-time":"2007-06-01T22:06:27Z","timestamp":1180735587000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":18,"title":["Distribution of blocking temperatures in nano-oxide layers of specular spin valves"],"prefix":"10.1063","volume":"101","author":[{"given":"J.","family":"Ventura","sequence":"first","affiliation":[{"name":"IN , Rua Alves Redol, 9-1, 1000-029 Lisbon, Portugal and IFIMUP and Faculty of Sciences, , Rua do Campo Alegre,678, 4169-007, Porto, Portugal"},{"name":"Universade do Porto , Rua Alves Redol, 9-1, 1000-029 Lisbon, Portugal and IFIMUP and Faculty of Sciences, , Rua do Campo Alegre,678, 4169-007, Porto, Portugal"}]},{"given":"J. P.","family":"Araujo","sequence":"additional","affiliation":[{"name":"IN , Rua Alves Redol, 9-1, 1000-029 Lisbon, Portugal and IFIMUP and Faculty of Sciences, , Rua do Campo Alegre,678, 4169-007, Porto, Portugal"},{"name":"Universade do Porto , Rua Alves Redol, 9-1, 1000-029 Lisbon, Portugal and IFIMUP and Faculty of Sciences, , Rua do Campo Alegre,678, 4169-007, Porto, Portugal"}]},{"given":"J. B.","family":"Sousa","sequence":"additional","affiliation":[{"name":"IN , Rua Alves Redol, 9-1, 1000-029 Lisbon, Portugal and IFIMUP and Faculty of Sciences, , Rua do Campo Alegre,678, 4169-007, Porto, Portugal"},{"name":"Universade do Porto , Rua Alves Redol, 9-1, 1000-029 Lisbon, Portugal and IFIMUP and Faculty of Sciences, , Rua do Campo Alegre,678, 4169-007, Porto, Portugal"}]},{"given":"A.","family":"Veloso","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":"IN , Rua Alves Redol, 9-1, 1000-029 Lisbon, Portugal and , Rua Alves Redol, 9-1, 1000-029 Lisbon, Portugal"},{"name":"INESC-MN and IST , Rua Alves Redol, 9-1, 1000-029 Lisbon, Portugal and , Rua Alves Redol, 9-1, 1000-029 Lisbon, Portugal"}]}],"member":"317","published-online":{"date-parts":[[2007,6,1]]},"reference":[{"key":"2023080503082547000_c1","doi-asserted-by":"publisher","first-page":"1297","DOI":"10.1103\/PhysRevB.43.1297","volume":"43","year":"1991","journal-title":"Phys. Rev. B"},{"key":"2023080503082547000_c2","doi-asserted-by":"publisher","first-page":"1020","DOI":"10.1063\/1.1288672","volume":"77","year":"2000","journal-title":"Appl. Phys. Lett."},{"key":"2023080503082547000_c3","doi-asserted-by":"publisher","first-page":"5321","DOI":"10.1063\/1.1459617","volume":"91","year":"2002","journal-title":"J. Appl. 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