{"id":78228,"date":"2018-03-09T23:23:50","date_gmt":"2018-03-09T23:23:50","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/efectos-cooperativos-en-la-relajacion-magnetica-de-aleaciones-nanometricas-de-fe-cu-ag\/"},"modified":"2018-03-09T23:23:50","modified_gmt":"2018-03-09T23:23:50","slug":"efectos-cooperativos-en-la-relajacion-magnetica-de-aleaciones-nanometricas-de-fe-cu-ag","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/efectos-cooperativos-en-la-relajacion-magnetica-de-aleaciones-nanometricas-de-fe-cu-ag\/","title":{"rendered":"Efectos cooperativos en la relajaci\u00f3n magn\u00e9tica de aleaciones nanom\u00e9tricas de fe-cu-ag."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Rebeca Garcia Calderon <\/strong><\/h2>\n<p>Las propiedades f\u00edsicas de los materiales sufren modificaciones cuando se reducen los tama\u00f1os de los espec\u00edmenes, especialmente cuando los tama\u00f1os involucrados entran dentro del rango de los nan\u00f3metros. As\u00ed, el estudio de los mecanismos que intervienen en estos comportamientos dependientes del tama\u00f1o ha producido el estallido de la nanociencia y de la nanotecnolog\u00eda. dentro del campo del magnetismo esto ha llevado al inter\u00e9s en sistemas magn\u00e9ticos heterog\u00e9neos. Para contribuir al estudio del comportamiento magn\u00e9tico de este tipo de materiales, se han sintetizado mediante el m\u00e9todo de aleaci\u00f3n mec\u00e1nica aleaciones ternarias de fe-cu-ag con distinta composici\u00f3n de las cuales se han seleccionado dos, fe13cu10ag77 y fe22cu14ag64 como las m\u00e1s adecuadas para el estudio de los fen\u00f3menos asociados a la relajaci\u00f3n magn\u00e9tica de part\u00edculas nanom\u00e9tricas. A partir de una detallada caracterizaci\u00f3n estructural de estas aleaciones mediante la obtenci\u00f3n de im\u00e1genes de superstem, el refinamiento rietveld conjunto (multipattern) de los resultados de difracci\u00f3n de rayos-x y de neutrones y el an\u00e1lisis de la difusi\u00f3n de neutrones a bajo \u00e1ngulo (sans), se ha concluido que estas aleaciones est\u00e1n formadas por part\u00edculas magn\u00e9ticas de fe (cu) en soluci\u00f3n s\u00f3lida de 4 ~ 4.6 nm, dispersas en una matriz diamagn\u00e9tica de ag. La \u00fanica variaci\u00f3n significativa entre las dos aleaciones es la concentraci\u00f3n de estas part\u00edculas magn\u00e9ticas, 18% en volumen para fe13cu10ag77 y 29% para fe22cu14ag64. Asimismo, se han detectado mediante sans agrupaciones de part\u00edculas, que al estar muy pr\u00f3ximas interacciionan fuertemente comport\u00e1ndose a bajas t o altos h como una sola de mayor tama\u00f1o. A partir de los resultados de mdc (h,t) y xac (t,h,v) y espectroscopia m\u00ed\u00b6ssbauer se deduce que existen interacciones entre las part\u00edculas de fe(cu) que condicionan la relajaci\u00f3n magn\u00e9tica del sistema. Estas interacciones magn\u00e9ticas son de tipo dipolar y aum<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Efectos cooperativos en la relajaci\u00f3n magn\u00e9tica de aleaciones nanom\u00e9tricas de fe-cu-ag.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Efectos cooperativos en la relajaci\u00f3n magn\u00e9tica de aleaciones nanom\u00e9tricas de fe-cu-ag. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Rebeca Garcia Calderon <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Cantabria<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 13\/01\/2006<\/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>Barquin Luis Fernandez<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal:  Labarta rodr\u00ed\u00b6guez <\/li>\n<li>mar\u00ed\u00b6a Luisa Fern\u00c2\u00b5ndez gubieda (vocal)<\/li>\n<li>Francisco jos\u00c2\u00bf L\u00c2\u00b5zaro osoro (vocal)<\/li>\n<li> Allia (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Rebeca Garcia Calderon Las propiedades f\u00edsicas de los materiales sufren modificaciones cuando se reducen los tama\u00f1os de [&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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