{"id":98532,"date":"2010-12-01T00:00:00","date_gmt":"2010-12-01T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/magnetism-and-spin-dependent-transport-at-interaces-between-complex-oxides-magnetismo-y-transporte-dependiente-de-espin-en-interfases-entre-oxidos-complejos\/"},"modified":"2010-12-01T00:00:00","modified_gmt":"2010-12-01T00:00:00","slug":"magnetism-and-spin-dependent-transport-at-interaces-between-complex-oxides-magnetismo-y-transporte-dependiente-de-espin-en-interfases-entre-oxidos-complejos","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/magnetism-and-spin-dependent-transport-at-interaces-between-complex-oxides-magnetismo-y-transporte-dependiente-de-espin-en-interfases-entre-oxidos-complejos\/","title":{"rendered":"Magnetism and spin dependent transport at interaces between complex oxides\/\/magnetismo y transporte dependiente de espin en interfases entre \u00f3xidos complejos"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Cristina Visani <\/strong><\/h2>\n<p>Se resumen a continuaci\u00f3n los resultados y las conclusiones principales de esta tesis. Hemos realizado un an\u00e1lisis de la interacci\u00f3n entre ferromagnetismo (f) y superconductividad (s) en heteroestructuras epitaxiales del superconductor de alta tc yba 2cu3o7 (ybco) y la manganita ferromagnetica la0.7ca0.3mno3 (lcmo). Encontramos grandes valores de magnetorresistencias positivas en tricapas lcmo\/ybco\/lcmo, que aparecen a lo largo de la transici\u00f3n superconductora, cuando la imanaci\u00f3n de las capas lc mo est\u00e1 alineada antiparalela. Se trata de un comportamiento an\u00f3malo que en la literatura se ha dado en denominar \u00c2\u00bfinterruptor\u00c2\u00bf superconductor inverso. El origen de este fen\u00f3meno es actualmente objeto de controvertido debate, en que el mecanismo por el que aumenta la ruptura de pares superconductoras debido a quasiparticulas polarizadas en espin se enfrenta al efecto de depresi\u00f3n de la superconductividad por el campo dipolar generado durante la inversi\u00f3n de la imanaci\u00f3n. Para un mejor entendimie nto del origen de esta magnetorresistencia hemos realizado experimentos en nuestras muestras utilizando distintas t\u00e9cnicas cuyos resultados se resumen en los siguientes puntos:  ? Encontramos una magnetorresistencia positiva que muestra valores mucho  m\u00e1s grandes que los observados en el gmr en superredes y heteroestructuras met\u00e1licas, en el que el efecto del campo dipolar se ha demostrado dominante. ? Hemos encontrado que la forma y la altura de los picos de magnetorresistencia no se modifican c uando la orientaci\u00f3n relativa de la corriente y el campo magn\u00e9tico cambia de paralela a perpendicular. M\u00e1s aun, observamos que el desplazamiento en temperatura de las curvas de resistencia es independiente de la corriente y del ritmo al que cambia el  campo magn\u00e9tico. Estas observaciones descartan cualquier interpretaci\u00f3n ya sea en t\u00e9rminos de v\u00f3rtices espont\u00e1neos o de magnetorresistencia anis\u00f3tropa de las capas ferromagneticas. ? La comparaci\u00f3n de tricapas y bicapas (que muestran magnetorresiste ncia negativa o ninguna magnetorresistencia dependiendo de las caracter\u00edsticas de la interfase lcmo\/ybco) permite descartar el efecto de los campos dipolares asociados a la estructura de dominios del ferromagnetico como la causa del fen\u00f3meno de \u00c2\u00bfinte rruptor\u00c2\u00bf superconductor inverso (iss). ? Medidas de magnetometr\u00eda combinadas con medidas de resonancia ferromagnetica, y con reflectometr\u00eda de neutrones polarizados, muestran que la anisotrop\u00eda magn\u00e9tica es biaxial con el eje f\u00e1cil a lo largo de las<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Magnetism and spin dependent transport at interaces between complex oxides\/\/magnetismo y transporte dependiente de espin en interfases entre \u00f3xidos complejos<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Magnetism and spin dependent transport at interaces between complex oxides\/\/magnetismo y transporte dependiente de espin en interfases entre \u00f3xidos complejos <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Cristina Visani <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Complutense de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 12\/01\/2010<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>barriga Santamar\u00eda Sanchez<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Jos\u00e9 Luis Vicent l\u00f3pez <\/li>\n<li>Javiereulogio Villegas hern\u00e1ndez (vocal)<\/li>\n<li>asunci\u00f3n de Andr\u00e9s Miguel (vocal)<\/li>\n<li>Mar\u00eda del mar Garc\u00eda hern\u00e1ndez (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Cristina Visani Se resumen a continuaci\u00f3n los resultados y las conclusiones principales de esta tesis. Hemos realizado [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","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":"","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":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","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-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-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-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-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-gradient":""}},"footnotes":""},"categories":[1],"tags":[201464,42669,201462,201463,118367,201465],"class_list":["post-98532","post","type-post","status-publish","format-standard","hentry","category-sin-categoria","tag-asuncion-de-andres-miguel","tag-barriga-santamaria-sanchez","tag-cristina-visani","tag-javiereulogio-villegas-hernandez","tag-jose-luis-vicent-lopez","tag-maria-del-mar-garcia-hernandez"],"_links":{"self":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts\/98532","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/comments?post=98532"}],"version-history":[{"count":0,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts\/98532\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/media?parent=98532"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/categories?post=98532"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/tags?post=98532"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}