{"id":24648,"date":"2003-11-07T00:00:00","date_gmt":"2003-11-07T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/caracterizacion-estructural-y-magnetica-de-los-solidos-granulares-de-cocu-y-su-correlacion-con-la-magnetorresistencia-gigante\/"},"modified":"2003-11-07T00:00:00","modified_gmt":"2003-11-07T00:00:00","slug":"caracterizacion-estructural-y-magnetica-de-los-solidos-granulares-de-cocu-y-su-correlacion-con-la-magnetorresistencia-gigante","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/pais-vasco-euskal-herriko-unibertsitatea\/caracterizacion-estructural-y-magnetica-de-los-solidos-granulares-de-cocu-y-su-correlacion-con-la-magnetorresistencia-gigante\/","title":{"rendered":"Caracterizaci\u00f3n estructural y magn\u00e9tica de los s\u00f3lidos granulares de cocu y su correlaci\u00f3n con la magnetorresistencia gigante"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Ana Garc\u00eda Prieto <\/strong><\/h2>\n<p>Los s\u00f3lidos granulares formados por gr\u00e1nulos magn\u00e9ticos embebidos en una matriz met\u00e1lica presentan un gran inter\u00e9s debido a sus potenciales aplicaciones tecnol\u00f3gicas, en particular en el campo de los sensores magn\u00e9ticos, ya que manifiestan un fen\u00f3meno, la magnetorresistencia gigante (gmr), que consiste en que bajo un campo magn\u00e9tico aplicado su resistencia el\u00e9ctrica disminuye notablemente.  en esta tesis se han estudiado cintas granulares de coxcu100-x obtenidas a partir de la t\u00e9cnica melt-spinning. Diferentes trozos de las muestras as\u00ed obtenidas, llamadas as-quenched (aq), han sido recocidas a temperaturas entre los 400 y 650\u00c2\u00bac con el objeto de modificar su estructura granular y correlacionarla con los cambios que provoca en la gmr.  as\u00ed, en primer lugar hemos caracterizado la gmr a 10k y un campo magn\u00e9tico m\u00e1ximo de 7t y hemos observado que el valor de saturaci\u00f3n de la gmr evoluciona de manera similar con la temperatura de recocido para las cuatro composiciones (x) estudiadas: aumenta fuertemente hasta los 400-450\u00c2\u00bac y cae al recocer a 500\u00c2\u00bac. El valor m\u00e1s alto conseguido es de 32% para la muestra x=15 recocida a 400\u00c2\u00bac.  el estudio de la microestructura se ha realizado por tres t\u00e9cnicas estructurales complementarias [difracci\u00f3n de rayos x (drx) y de neutrones a bajo \u00e1ngulo (sans) y exafs (extended x-ray absorption fine estructure)] y a partir del an\u00e1lisis magn\u00e9tico, que indirectamente nos ha proporcionado valiosa informaci\u00f3n estructural debido a que los gr\u00e1nulos magn\u00e9ticos presentan respuetas magn\u00e9ticas diferentes dependiendo de su tama\u00f1o.  as\u00ed, hemos observado que ya en las muestas aq el co se distribuye en gr\u00e1nulos ferromagn\u00e9ticos (fm) de 20-40 nm, nanogr\u00e1nulos superparamagn\u00e9ticos (spm) de 2-3 nm y que existe tambi\u00e9n una cierta cantidad de \u00e1tomos de co que se encuentran diluidos en la matriz de cu con una d\u00e9bil se\u00f1al paramagn\u00e9tica.  al recocer, se induce un proceso de segregaci\u00f3n y los \u00e1tom<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Caracterizaci\u00f3n estructural y magn\u00e9tica de los s\u00f3lidos granulares de cocu y su correlaci\u00f3n con la magnetorresistencia gigante<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Caracterizaci\u00f3n estructural y magn\u00e9tica de los s\u00f3lidos granulares de cocu y su correlaci\u00f3n con la magnetorresistencia gigante <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Ana Garc\u00eda Prieto <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Pa\u00eds vasco\/euskal herriko unibertsitatea<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 11\/07\/2003<\/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>cubieda Ruiz M. Luisa Fern\u00e1ndez<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal:  Barandiaran Garc\u00eda Jos\u00e9 manuel <\/li>\n<li>joaqu\u00edn Garc\u00eda ruiz (vocal)<\/li>\n<li>settimio Mobilio (vocal)<\/li>\n<li>paolo Allia (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Ana Garc\u00eda Prieto Los s\u00f3lidos granulares formados por gr\u00e1nulos magn\u00e9ticos embebidos en una matriz met\u00e1lica presentan un [&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":[12909],"tags":[72290,12959,72291,72292,72294,72293],"class_list":["post-24648","post","type-post","status-publish","format-standard","hentry","category-pais-vasco-euskal-herriko-unibertsitatea","tag-ana-garcia-prieto","tag-barandiaran-garcia-jose-manuel","tag-cubieda-ruiz-m-luisa-fernandez","tag-joaquin-garcia-ruiz","tag-paolo-allia","tag-settimio-mobilio"],"_links":{"self":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts\/24648","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=24648"}],"version-history":[{"count":0,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts\/24648\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/media?parent=24648"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/categories?post=24648"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/tags?post=24648"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}