{"id":19325,"date":"2002-03-10T00:00:00","date_gmt":"2002-03-10T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/endurecimiento-magnetico-inducido-por-el-acoplamiento-ferromagnetico-antiferromagnetico\/"},"modified":"2002-03-10T00:00:00","modified_gmt":"2002-03-10T00:00:00","slug":"endurecimiento-magnetico-inducido-por-el-acoplamiento-ferromagnetico-antiferromagnetico","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/endurecimiento-magnetico-inducido-por-el-acoplamiento-ferromagnetico-antiferromagnetico\/","title":{"rendered":"Endurecimiento magn\u00e9tico inducido por el acoplamiento ferromagn\u00e9tico-antiferromagn\u00e9tico"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Jordi Sort Vi\u00f1as <\/strong><\/h2>\n<p>Es bien sabido que las interacciones de canje inducidas entre materiales ferromagn\u00e9ticos (fm) y antiferromagn\u00e9ticos (afm) cuando son enfriados desde una temperatura superior a la temperatura de n\u00e9el, tn, del afm, hacen aumentar la coercividad, hc, del componente fm. Nosotros hemos analizado los efectos de hacer una molienda mec\u00e1nica de polvos fm (co o smco5) con afm (con tn, ya sea por encima de temperatura ambiente, por ejemplo el nio, o por debajo, por ejemplo el coo). Se han estudiado varias combinaciones (co + nio, smco5 + nio y smco5 + coo), dando especial \u00e9nfasis a los sistemas fm + nio. Los distintos comportamientos estructurales y magn\u00e9ticos del co y del smco5 durante la molienda y los tratamientos t\u00e9rmicos hacen necesario adaptar la ruta de procesado adecuadamente para cada caso. As\u00ed, en los sistemas co + afm los efectos de las interacciones fm-afm se inducen mayoritariamente despu\u00e9s de un enfriado en campo de los polvos molidos desde t &gt; tn.  contrariamente, en polvos smc05 + afm, los tratamientos t\u00e9rmicos deterioran enormemente las propiedades magn\u00e9ticas duras del smco5. De todas formas, un an\u00e1lisis comparativo de las propiedades del smco5 molido con nio o con coo parece indicar que, en cierto grado, las interacciones de canje pueden, de hecho, inducirse en el smco5 + nio durante la molienda. Las interacciones del canje fm-afm se manifiestan en un desplazamiento del ciclo de hist\u00e9resis y unos aumentos de hc y de la raz\u00f3n de cuadratura, mr\/ms. Estos efectos se observan a temperatura ambiente siempre que tn sea mayor que la temperatura ambiente (por ejemplo, con nio). Adem\u00e1s, si se optimizan las proporciones de fm a afm, as\u00ed como las condiciones de molienda, tambi\u00e9n es posible aumentar, hasta cierto punto, el producto de energ\u00eda, (bh)max. Por un lado, el aumento del contenido de afm hace aumentar las interacciones fm-afm (induciendo un aumento de hc y mr\/ms). Sin embargo, como la imanaci\u00f3n de un afm es pr\u00e1ct<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Endurecimiento magn\u00e9tico inducido por el acoplamiento ferromagn\u00e9tico-antiferromagn\u00e9tico<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Endurecimiento magn\u00e9tico inducido por el acoplamiento ferromagn\u00e9tico-antiferromagn\u00e9tico <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Jordi Sort Vi\u00f1as <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Aut\u00f3noma de barcelona<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 03\/10\/2002<\/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>Mar\u00eda Dolores Bar\u00f3 Marin\u00e9<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: jordi Pascual gainza <\/li>\n<li>Jos\u00e9 Rivas rey (vocal)<\/li>\n<li>Antonio Hernando grande (vocal)<\/li>\n<li>Manuel ricardo Ibarra garcia (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Jordi Sort Vi\u00f1as Es bien sabido que las interacciones de canje inducidas entre materiales ferromagn\u00e9ticos (fm) y [&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 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