{"id":6285,"date":"2026-10-19T09:48:43","date_gmt":"2026-10-19T09:48:43","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-edlisfraedi-kristbjorg-anna-thorarinsdottir\/"},"modified":"2026-10-19T09:48:43","modified_gmt":"2026-10-19T09:48:43","slug":"doktorsvorn-i-edlisfraedi-kristbjorg-anna-thorarinsdottir","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-edlisfraedi-kristbjorg-anna-thorarinsdottir\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed e\u00f0lisfr\u00e6\u00f0i \u2013 Kristbj\u00f6rg Anna \u00de\u00f3rarinsd\u00f3ttir"},"content":{"rendered":"<div class=\"field-items\">\n<div class=\"field-item even\" property=\"content:encoded\">\n<p><a href=\"https:\/\/livestream.com\/hi\">Streymi\u00a0<\/a><\/p>\n<p><strong>Doktorsefni:<\/strong>\u00a0Kristbj\u00f6rg Anna \u00de\u00f3rarinsd\u00f3ttir<\/p>\n<p><strong>Heiti ritger\u00f0ar:<\/strong>\u00a0Regla \u00ed \u00f3reglu: Seguleiginleikar \u00feunnra myndlausra k\u00f3balth\u00fa\u00f0a og marglaga (The order in disorder: Magnetism in amorphous cobalt-based thin films and heterostructures)<\/p>\n<p><strong>Andm\u00e6lendur:<\/strong><strong><br \/> <\/strong>Dr. Eric Fullerton, pr\u00f3fessor vi\u00f0 University of California San Diego, Bandar\u00edkjunum<br \/> Dr. Sarah Thompson, pr\u00f3fessor vi\u00f0 University of York, Bretlandi\u00a0<\/p>\n<p><strong>Lei\u00f0beinandi:<\/strong>\u00a0Dr. Fri\u00f0rik Magnus, pr\u00f3fessor vi\u00f0 Raunv\u00edsindadeild H\u00cd<\/p>\n<p><strong>Einnig \u00ed doktorsnefnd:<\/strong><strong><br \/> <\/strong>Dr. Snorri \u00deorgeir Ingvarsson, pr\u00f3fessor vi\u00f0 Raunv\u00edsindadeild H\u00cd<br \/> Dr. Bj\u00f6rgvin Hj\u00f6rvarsson, pr\u00f3fessor vi\u00f0 Uppsalah\u00e1sk\u00f3la, Sv\u00ed\u00fej\u00f3\u00f0<\/p>\n<p><strong>Doktorsv\u00f6rn st\u00fdrir:<\/strong>\u00a0Dr. Einar \u00d6rn Sveinbj\u00f6rnsson, pr\u00f3fessor og deildarforseti Raunv\u00edsindadeildar H\u00cd<\/p>\n<p><strong>\u00c1grip<\/strong><\/p>\n<p>\u00cd verkefninu er leitast vi\u00f0 a\u00f0 auka skilning okkar \u00e1 seguleiginleikum myndlausra efna. Myndlaus efni skortir langr\u00e6kna kristaluppbyggingu, en \u00feess \u00ed sta\u00f0 geta \u00feau haft stutta e\u00f0a me\u00f0allanga reglubundna uppr\u00f6\u00f0un. Fyrst er s\u00fdnt hvernig seguleiginleikar j\u00e1rnseglandi Co breytast me\u00f0 \u00fev\u00ed a\u00f0 mynda melmi me\u00f0 \u00f3seglandi AlZr. \u00dea\u00f0 s\u00e9st a\u00f0 Curie-hitastigi\u00f0 og segulv\u00e6gi\u00f0 \u00e1 CoAlZr stj\u00f3rnast af samsetningunni, og minnkar l\u00ednulega me\u00f0 auknu AlZr-innihaldi. Vegna \u00f3rei\u00f0ukenndrar uppr\u00f6\u00f0unar \u00e1 myndlausum efnum er sta\u00f0bundin dreifing \u00ed Co-innihaldi me\u00f0 sv\u00e6\u00f0um af h\u00e1um og l\u00e1gum \u00fe\u00e9ttleika Co. \u00deetta lei\u00f0ir til sv\u00e6\u00f0a \u00e1 nan\u00f3-skala me\u00f0 h\u00e1u og l\u00e1gu Curie-hitastigi. \u00d3v\u00e6nt birtingarmynd s\u00e9st af \u00feessari dreifingu \u00ed efnasamsetningu, sem kemur fram sem keppni milli \u00f3l\u00edkrar segulmis\u00e1ttunar. Me\u00f0 \u00fev\u00ed a\u00f0 m\u00e6la hver segulmis\u00e1ttunin er sem fall af samsetningu, er unnt a\u00f0 skilgreina Co-samsetningardreifingu.<\/p>\n<p>Einnig eru ranns\u00f6ku\u00f0 fj\u00f6ll\u00f6g af h\u00e1- og l\u00e1g-T_c CoAlZr l\u00f6gum \u00e1 v\u00edxl og tv\u00edl\u00f6gum af TbCo\/CoAlZr. \u00cd CoAlZr-fj\u00f6ll\u00f6gunum er s\u00fdnt a\u00f0 \u00ed l\u00e1g-T_c-laginu er framkalla\u00f0ur ofurme\u00f0seglandi fasi vegna n\u00e1l\u00e6g\u00f0ar vi\u00f0 h\u00e1-T_c-lagi\u00f0. \u00deetta segul\u00e1stand er langreiki\u00f0 og er til sta\u00f0ar vi\u00f0 hitastig sem er \u00ferisvar sinnum h\u00e6rra en innra Curie-hitastig l\u00e1g-T_c lagsins. \u00cd TbCo\/CoAlZr-tv\u00edl\u00f6gunum eru rannsaka\u00f0ir segulskiptikraftar milli laga me\u00f0 hornr\u00e9tta og l\u00e1r\u00e9tta segulmis\u00e1ttun mi\u00f0a\u00f0 vi\u00f0 plan s\u00fdnisins. Vi\u00f0 greinum sv\u00e6\u00f0i \u00ed CoAlZr-laginu, \u00fear sem spunarnir eru sterkt k\u00fapla\u00f0ir vi\u00f0 TbCo-lagi\u00f0 og hluti spuna\u00e1fer\u00f0ar CoAlZr-lagsins liggur \u00fevert \u00e1 h\u00fa\u00f0ina. \u00deetta sv\u00e6\u00f0i hefur svipa\u00f0a seguleiginleika og TbCo-lagi\u00f0 og verkar \u00fev\u00ed eins og segulgormur. \u00deessi lagskiptu efni m\u00e6tti t.d. hagn\u00fdta \u00ed segulminnum og segul\u00f6rsveiflum.<\/p>\n<p><strong>Um doktorsefni\u00f0<\/strong><\/p>\n<p>Kristbj\u00f6rg Anna \u00de\u00f3rarinsd\u00f3ttir er f\u00e6dd 1992. H\u00fan h\u00f3f B.Sc. n\u00e1m vi\u00f0 H\u00e1sk\u00f3la \u00cdslands 2013 og \u00fatskrifa\u00f0ist \u00e1ri\u00f0 2016. H\u00fan h\u00f3f meistaran\u00e1m vi\u00f0 H\u00e1sk\u00f3lann \u00ed \u00c1r\u00f3sum \u00ed Danm\u00f6rku \u00e1ri\u00f0 2016 og lauk \u00fev\u00ed 2018, og byrja\u00f0i kj\u00f6lfari\u00f0 \u00ed doktorsn\u00e1mi vi\u00f0 H\u00e1sk\u00f3la \u00cdslands.<\/p>\n<\/div><\/div>","protected":false},"featured_media":5144,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_phd_date_start":"2022-06-20T14:00:00+00:00","_phd_date_end":"2022-06-20T16:00:00+00:00","_phd_location":"A\u00f0albygging H\u00e1t\u00ed\u00f0arsalur","_phd_admission":"A\u00f0gangur \u00f3keypis","_phd_thesis_title":"Regla \u00ed \u00f3reglu: Seguleiginleikar \u00feunnra myndlausra k\u00f3balth\u00fa\u00f0a og marglaga (The order in disorder: Magnetism in amorphous cobalt-based thin films and heterostructures)","_phd_source_url":"https:\/\/gamli.hi.is\/vidburdir\/doktorsvorn_i_edlisfraedi_kristbjorg_anna_thorarinsdottir","_phd_source_node_id":"388921","_phd_source_type":"vidburdir","_phd_member_id":814,"footnotes":""},"phd_school":[101,93],"phd_discipline":[105],"class_list":["post-6285","phd_defence","type-phd_defence","status-publish","has-post-thumbnail","hentry","phd_school-raunvisindadeild","phd_school-verkfraedi-og-natturuvisindasvid","phd_discipline-phd-i-edlisfraedi"],"_links":{"self":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6285","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence"}],"about":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/types\/phd_defence"}],"version-history":[{"count":0,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6285\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media\/5144"}],"wp:attachment":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media?parent=6285"}],"wp:term":[{"taxonomy":"phd_school","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_school?post=6285"},{"taxonomy":"phd_discipline","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_discipline?post=6285"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}