{"id":406,"date":"2015-04-02T10:12:26","date_gmt":"2015-04-02T08:12:26","guid":{"rendered":"http:\/\/hebergement.u-psud.fr\/joovon\/?p=406"},"modified":"2015-04-02T10:53:56","modified_gmt":"2015-04-02T08:53:56","slug":"the-nature-of-domain-walls-in-ultrathin-ferromagnets-revealed-by-scanning-nanomagnetometry","status":"publish","type":"post","link":"https:\/\/hebergement.universite-paris-saclay.fr\/joovon\/?p=406","title":{"rendered":"The nature of domain walls in ultrathin ferromagnets revealed by scanning nanomagnetometry"},"content":{"rendered":"<p><a href=\"http:\/\/hebergement.u-psud.fr\/joovon\/wp-content\/uploads\/2015\/04\/ncomms7733-i1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-407\" src=\"http:\/\/hebergement.u-psud.fr\/joovon\/wp-content\/uploads\/2015\/04\/ncomms7733-i1.jpg\" alt=\"ncomms7733-i1\" width=\"200\" height=\"200\" srcset=\"https:\/\/hebergement.universite-paris-saclay.fr\/joovon\/wp-content\/uploads\/2015\/04\/ncomms7733-i1.jpg 100w, https:\/\/hebergement.universite-paris-saclay.fr\/joovon\/wp-content\/uploads\/2015\/04\/ncomms7733-i1-60x60.jpg 60w\" sizes=\"auto, (max-width: 200px) 100vw, 200px\" \/><\/a><\/p>\n<p><strong>Reference<\/strong>: <a href=\"http:\/\/dx.doi.org\/10.1038\/ncomms7733\" target=\"_blank\">J.-P. Tetienne, T. Hingant <em>et al<\/em>., Nat. Commun. <strong>6<\/strong>, 6733 (2015).<\/a><\/p>\n<p>Our recent study on the nature of magnetic domain walls in ultrathin ferromagnetic\u00a0films has just appeared in <em>Nature Communications<\/em>.<\/p>\n<p><!--more--><\/p>\n<p>In ultrathin ferromagnetic films with perpendicular anisotropy, such as Ta\/CoFeB (1 nm)\/MgO and Pt\/Co (0.6 nm)\/AlOx, it has been suggested that the presence of an interfacial chiral interaction of the Dzyaloshinskii-Moriya form, arising from the strong spin-orbit interaction in the &#8220;heavy metal&#8221; underlayer (Ta, Pt), could have a significant impact on the spin structure of the domain walls in such films. In particular, a sufficiently strong Dzyaloshinskii-Moriya interaction can favour N\u00e9el domain wall states over the Bloch states expected for such films. By using a novel scanning magnetometry method based on a single nitrogen-vacancy defect in a diamond nanocrystal, my colleagues at the <a href=\"http:\/\/www.lac.u-psud.fr\/?lang=en\" target=\"_blank\">Laboratoire Aim\u00e9 Cotton in Orsay<\/a> have shown unequivocally that the Dzyaloshinskii-Moriya interaction is large enough to promote N\u00e9el walls in Pt\/Co (0.6 nm)\/AlOx, while no signature of this interaction is present in Ta\/CoFeB (1 nm)\/MgO.<\/p>\n<p>This finding has some important consequences on possible applications involving magnetic domain walls, such as <a href=\"http:\/\/en.wikipedia.org\/wiki\/Racetrack_memory\" target=\"_blank\">racetrack memories<\/a>, since current-driven spin torques like the spin Hall effect influence Bloch and N\u00e9el walls differently. Moreover, the presence of a strong Dzyaloshinskii-Moriya interaction in Pt\/Co (0.6 nm)\/AlOx suggests that such material structures could be promising for harbouring exotic chiral spin structures such as skyrmions.<\/p>\n<div class=\"post-meta\">Last modified 2\/04\/15<\/div>","protected":false},"excerpt":{"rendered":"<p>Reference: J.-P. Tetienne, T. Hingant et al., Nat. Commun. 6, 6733 (2015). Our recent study on the nature of magnetic domain walls in ultrathin ferromagnetic\u00a0films has just appeared in Nature Communications. Last modified 2\/04\/15<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[12,21,22],"class_list":["post-406","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-dmi","tag-domain-walls","tag-nv-center-magnetometry"],"_links":{"self":[{"href":"https:\/\/hebergement.universite-paris-saclay.fr\/joovon\/index.php?rest_route=\/wp\/v2\/posts\/406","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hebergement.universite-paris-saclay.fr\/joovon\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hebergement.universite-paris-saclay.fr\/joovon\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hebergement.universite-paris-saclay.fr\/joovon\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hebergement.universite-paris-saclay.fr\/joovon\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=406"}],"version-history":[{"count":3,"href":"https:\/\/hebergement.universite-paris-saclay.fr\/joovon\/index.php?rest_route=\/wp\/v2\/posts\/406\/revisions"}],"predecessor-version":[{"id":410,"href":"https:\/\/hebergement.universite-paris-saclay.fr\/joovon\/index.php?rest_route=\/wp\/v2\/posts\/406\/revisions\/410"}],"wp:attachment":[{"href":"https:\/\/hebergement.universite-paris-saclay.fr\/joovon\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=406"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hebergement.universite-paris-saclay.fr\/joovon\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=406"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hebergement.universite-paris-saclay.fr\/joovon\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=406"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}