{"id":1484,"date":"2023-05-17T14:12:25","date_gmt":"2023-05-17T14:12:25","guid":{"rendered":"https:\/\/wp.icmm.csic.es\/nanocarma\/?p=1484"},"modified":"2023-05-17T14:32:04","modified_gmt":"2023-05-17T14:32:04","slug":"transition-from-afm-spin-canting-to-spin-glass-afm-exchange-as-particle-size-decreases-in-lafeo3","status":"publish","type":"post","link":"https:\/\/wp.icmm.csic.es\/nanocarma\/?p=1484","title":{"rendered":"Transition from AFM Spin Canting to Spin Glass\u2013AFM Exchange as Particle Size Decreases in LaFeO3"},"content":{"rendered":"

\"\"\"\"\"\"<\/p>\n

In this work, we have studied structural and magnetic properties of LaFeO3<\/SUB> as a function of the particle size d, from bulk (d >> 1 \u03bcm) to nanoscale (d \u2248 30 nm). A large number of twins were observed for large particles that disappear for small particle sizes. This could be related to the softening of the FeO6<\/SUB> distortion as particle size decreases. It was observed that the bulk sample showed spin canting that disappeared for d ~ 125 nm and can be associated with the smoothening of the orthorhombic distortion. On the other hand, for d < 60 nm, the surface\/volume ratio became high and, despite the high crystallinity of the nanoparticle, a notable exchange effect bias appeared, originated by two magnetic interactions: spin glass and antiferromagnetism. This exchange bias interaction was originated by the formation of a \u201cmagnetic core\u2013shell\u201d: the broken bonds at the surface atoms give place to a spin glass behavior, whereas the inner atoms maintain the anti-ferromagnetic G-type order. The LaFeO3<\/SUB> bulk material was synthesized by the ceramic method, whereas the LaFeO3<\/SUB> nanoparticles were synthesized by the sol-gel method; the particle size was varied by annealing the samples at different temperatures. The physical properties of the materials have been investigated by XRD, HRTEM, TGA, and AC and DC magnetometry.<\/p>\n

En este trabajo hemos estudiado las propiedades estructurales y magn\u00e9ticas de LaFeO3<\/SUB> en funci\u00f3n del tama\u00f1o de part\u00edcula d, desde un tama\u00f1o de part\u00edcula grande (d >> 1 \u03bcm) hasta nanoescala (d \u2248 30 nm). Se observ\u00f3 un gran n\u00famero de maclas para part\u00edculas grandes que desaparecen para part\u00edculas peque\u00f1as. Esto podr\u00eda estar relacionado con el ablandamiento de la distorsi\u00f3n de los octaedros FeO6<\/SUB> a medida que disminuye el tama\u00f1o de las part\u00edculas. Se observ\u00f3 que la muestra m\u00e1sica mostr\u00f3 un \u201ccanting\u201d de esp\u00edn que desapareci\u00f3 para d ~ 125 nm y puede estar asociada con el suavizado de la distorsi\u00f3n ortorr\u00f3mbica. Por otro lado, para d < 60 nm, la relaci\u00f3n superficie\/volumen se hizo elevada y, a pesar de la alta cristalinidad de la nanopart\u00edcula, apareci\u00f3 un notable \u201cbias\u201d por efecto de intercambio, originado por dos interacciones magn\u00e9ticas: \u201cspin glass\u201d y antiferromagnetismo. Esta interacci\u00f3n de intercambio de \u201cbias\u201d se origin\u00f3 por la formaci\u00f3n de un \u00abcore-shell\u201d magn\u00e9tico: los enlaces rotos en los \u00e1tomos de la superficie dan lugar a un comportamiento de vidrio de esp\u00edn, mientras que los \u00e1tomos internos mantienen el orden antiferromagn\u00e9tico de tipo G. El material m\u00e1sico de LaFeO3<\/SUB> se sintetiz\u00f3 mediante el m\u00e9todo cer\u00e1mico, mientras que las nanopart\u00edculas de LaFeO3<\/SUB> se sintetizaron mediante el m\u00e9todo sol-gel; el tama\u00f1o de part\u00edcula se vari\u00f3 recociendo las muestras a diferentes temperaturas. Las propiedades f\u00edsicas de los materiales se han investigado mediante XRD, HRTEM, TGA y magnetometr\u00eda AC y DC.<\/p>\n

D. Alshalawi, J. M. Alonso, A. R. Landa-C\u00e1novas, and P. de la Presa, \u201cTransition from AFM Spin Canting to Spin Glass\u2013AFM Exchange as Particle Size Decreases in LaFeO3<\/sub>,\u201d Nanomaterials 13<\/strong>, 1657 (2023)<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

In this work, we have studied structural and magnetic properties of LaFeO3 as a function of the particle size d, from bulk (d >> 1 \u03bcm) to nanoscale (d \u2248 30 nm). A large number of twins were observed for … Sigue leyendo →<\/span><\/a><\/p>\n","protected":false},"author":77,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[7,16,77],"tags":[],"class_list":["post-1484","post","type-post","status-publish","format-standard","hentry","category-hrtem","category-publications","category-transition-metal-oxides"],"_links":{"self":[{"href":"https:\/\/wp.icmm.csic.es\/nanocarma\/index.php?rest_route=\/wp\/v2\/posts\/1484","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.icmm.csic.es\/nanocarma\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wp.icmm.csic.es\/nanocarma\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/nanocarma\/index.php?rest_route=\/wp\/v2\/users\/77"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/nanocarma\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1484"}],"version-history":[{"count":15,"href":"https:\/\/wp.icmm.csic.es\/nanocarma\/index.php?rest_route=\/wp\/v2\/posts\/1484\/revisions"}],"predecessor-version":[{"id":1506,"href":"https:\/\/wp.icmm.csic.es\/nanocarma\/index.php?rest_route=\/wp\/v2\/posts\/1484\/revisions\/1506"}],"wp:attachment":[{"href":"https:\/\/wp.icmm.csic.es\/nanocarma\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1484"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/nanocarma\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1484"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/nanocarma\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1484"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}