{"id":9357,"date":"2017-07-07T19:27:39","date_gmt":"2017-07-07T22:27:39","guid":{"rendered":"http:\/\/scienceblogs.com.br\/hypercubic\/?p=9357"},"modified":"2017-07-07T19:27:39","modified_gmt":"2017-07-07T22:27:39","slug":"de-volta-aos-nos-de-kelvin","status":"publish","type":"post","link":"https:\/\/www.blogs.unicamp.br\/hypercubic\/2017\/07\/de-volta-aos-nos-de-kelvin\/","title":{"rendered":"De volta aos n\u00f3s de Kelvin"},"content":{"rendered":"<h4 style=\"text-align: justify\">Houve um tempo em que \u00e1tomos eram imaginados como n\u00f3s parecidos com os que se faz com l\u00e3. Hoje estamos descobrindo uma classe de nanopart\u00edculas magn\u00e9ticas que \u00e9 exatamente assim.<\/h4>\n<p style=\"text-align: justify\">No fim do s\u00e9culo XIX, ningu\u00e9m sabia ao certo como eram os \u00e1tomos e como eles se ligavam. Uma das teorias mais sofisticadas da \u00e9poca era a de Lorde Kelvin, que via os \u00e1tomos como min\u00fasculos n\u00f3s de mat\u00e9ria, que poderiam se ligar da mesma forma que os pontos de croch\u00ea ou tric\u00f4. Essa teoria caiu no esquecimento \u00e0 medida que descobrimos que os \u00e1tomos s\u00e3o bem mais complexos do que parecem, com seus enxames de el\u00e9trons e densos n\u00facleos de pr\u00f3tons e n\u00eautrons.<\/p>\n<p style=\"text-align: justify\">Nos \u00faltimos anos, por\u00e9m, essa ideia vem sendo redescoberta pela engenharia de materiais. Os cientistas dessa \u00e1rea chamam os n\u00f3s de <em>skyrmions<\/em>, uma classe de nanopart\u00edculas formada pelo enla\u00e7amento de um campo que pode ser o magn\u00e9tico, por exemplo. Os <em>skyrmions<\/em> magn\u00e9ticos est\u00e3o sendo explorados recentemente em busca de potenciais aplica\u00e7\u00f5es na spintr\u00f4nica. Esse ramo da f\u00edsica busca usar o <em>spin<\/em> dos el\u00e9trons \u2014\u00a0uma propriedade relacionada ao magnetismo dos el\u00e9trons \u2014\u00a0para fins computacionais, como o armazenamento e processamento de dados.<\/p>\n<p style=\"text-align: justify\">N\u00e3o faz muito tempo que os skyrmions magn\u00e9ticos foram observados experimentalmente em fatias muito finas de materiais magn\u00e9ticos \u2014\u00a0t\u00e3o finas que podem ser consideradas bidimensionais. Seria poss\u00edvel formar nano-n\u00f3s tridimensionais? Paul Sutcliffe, f\u00edsico-matem\u00e1tico da Universidade Durham (Reino Unido), demonstrou que sim. Em <em>paper<\/em> publicado na <em>Physical Review Letters<\/em>, ele explica o que considera uma &#8220;ressurrei\u00e7\u00e3o em nanoescala do sonho de campos em n\u00f3s de Kelvin&#8221;.<\/p>\n<p style=\"text-align: justify\">Segundo Sutcliffe, os nano-n\u00f3s magn\u00e9ticos podem ser descritos pela carga Hopf, uma grandeza que indica o n\u00famero de vezes que as linhas magn\u00e9ticas curvadas de um <em>skyrmion<\/em> se entrela\u00e7am. Um n\u00famero de Hopf baixo indica a forma\u00e7\u00e3o de an\u00e9is enquanto altos Hopf refletem a forma\u00e7\u00e3o de estruturas magn\u00e9ticas mais complexas, como la\u00e7os e n\u00f3s.<\/p>\n<figure style=\"width: 561px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-large\" src=\"https:\/\/3c1703fe8d.site.internapcdn.net\/newman\/csz\/news\/800\/2017\/magneticskyr.jpg\" alt=\"Simula\u00e7\u00e3o de skyrmions magn\u00e9ticos como n\u00fameros de Hopf iguais a 3 (a), 6 (b), 7 (c) e 10 (d). Imagem: Sutcliffe (2017)\" width=\"561\" height=\"436\" \/><figcaption class=\"wp-caption-text\">Simula\u00e7\u00e3o de <em>skyrmions<\/em> magn\u00e9ticos como n\u00fameros de Hopf iguais a 3 (a), 6 (b), 7 (c) e 10 (d). Imagem: Sutcliffe (2017)<\/figcaption><\/figure>\n<p style=\"text-align: justify\">Para descobrir isso, Sutcliffe investigou as caracter\u00edstica de um tipo especial de \u00edm\u00e3, conhecido como <a href=\"http:\/\/www-thphys.physics.ox.ac.uk\/people\/FionaBurnell\/frusmag.html\">\u00edm\u00e3 frustrado<\/a>. Esse tipo de material d\u00e1 aos <em>skyrmions <\/em>uma dose extra de liberdade rotacional. Com essa dimens\u00e3o adicional, \u00e9 poss\u00edvel formar nano-n\u00f3s magn\u00e9ticos tridimensionais. &#8220;O ponto mais significante \u00e9 que esses nano-n\u00f3s s\u00e3o est\u00e1veis, porque normalmente os campos evitam ser enla\u00e7ados porque se desenrolam&#8221;, explicou o brit\u00e2nico ao <a href=\"https:\/\/phys.org\/news\/2017-06-magnetic-nanoknots-evoke-lord-kelvin.html\"><em>Phys.org<\/em><\/a>.<\/p>\n<p style=\"text-align: justify\">Surpreendentemente, os <em>skyrmions <\/em>de Sutcliffe n\u00e3o passaram muito tempo na teoria. Tend\u00eancia em laborat\u00f3rios de todo o mundo, o nanotric\u00f4 tamb\u00e9m estava sendo estudado na China enquanto o matem\u00e1tico brit\u00e2nico elaborava seu artigo. Assim, poucos dias ap\u00f3s a publica\u00e7\u00e3o do trabalho te\u00f3rico, pesquisadores chineses relataram num <em>pr\u00e9-print<\/em> a primeira observa\u00e7\u00e3o experimental de <em>skyrmions<\/em> em um \u00edm\u00e3 frustrado.<\/p>\n<p style=\"text-align: justify\">Os nano-n\u00f3s s\u00e3o uma tend\u00eancia que voltaram pra ficar. Outros trabalhos recentes t\u00eam indicado que os <em>skyrmions<\/em> podem ser manejados por diversos m\u00e9todos \u2014\u00a0como v\u00f3rtices \u00f3pticos e nanobast\u00f5es ferromagn\u00e9ticos, que mais parecem tecnologia de fic\u00e7\u00e3o cient\u00edfica \u2014\u00a0mas ainda n\u00e3o est\u00e1 claro qual \u00e9 o melhor e mais pr\u00e1tico. Tamb\u00e9m est\u00e3o sendo desenvolvidos sistemas de detec\u00e7\u00e3o de <em>skyrmions<\/em> por imagem. Por isso, Sutcliffe est\u00e1 otimista com suas descobertas e planeja aprofundar suas pesquisas para explicar como se formam os nano-n\u00f3s magn\u00e9ticos e como eles poderiam ser utilizados na pr\u00e1tica.<\/p>\n<h4>Refer\u00eancias<\/h4>\n<p style=\"padding-left: 30px\"><a href=\"http:\/\/scienceblogs.com.br\/hypercubic\/files\/2012\/07\/rb2_large_gray25.png\" data-rel=\"lightbox-image-0\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img decoding=\"async\" class=\"alignleft size-full wp-image-3123\" src=\"http:\/\/scienceblogs.com.br\/hypercubic\/files\/2012\/07\/rb2_large_gray25.png\" alt=\"rb2_large_gray25\" width=\"70\" height=\"85\" \/><\/a>SUTCLIFFE, Paul. <strong>Skyrmion Knots in Frustrated Magnets<\/strong> [<em><strong>N\u00f3s skyrmion em \u00edm\u00e3s frustrados<\/strong><\/em>]. <em>Physical Review Letters,\u00a0<\/em>118, 247203 \u2013 Published 16 June 2017. <a href=\"https:\/\/journals.aps.org\/prl\/abstract\/10.1103\/PhysRevLett.118.247203\">DOI: 10.1103\/PhysRevLett.118.247203<\/a>. Tamb\u00e9m dispon\u00edvel em: <a href=\"https:\/\/arxiv.org\/abs\/1705.10966\">arXiv:1705.10966 [cond-mat.mes-hall]<\/a><\/p>\n<p style=\"padding-left: 30px\">HOU, Zhipeng <em>et. al.<\/em> <strong>Observation of Various and Spontaneous Magnetic Skyrmionic Bubbles at Room-Temperature in a Frustrated Kagome Magnet with Uniaxial Magnetic Anisotropy<\/strong> [<em><strong>Observa\u00e7\u00e3o de v\u00e1rias e espont\u00e2neas bolhas skyrmi\u00f4nicas em magneto frustrado Kagome a temperatura ambiente com anisotropia magn\u00e9tica uniaxial<\/strong><\/em>] <a href=\"https:\/\/arxiv.org\/abs\/1706.05177\">arXiv:1706.05177 [cond-mat.mtrl-sci]<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Houve um tempo em que \u00e1tomos eram imaginados como n\u00f3s parecidos com os que se faz com l\u00e3. Hoje estamos descobrindo uma classe de nanopart\u00edculas magn\u00e9ticas que \u00e9 exatamente assim. No fim do s\u00e9culo XIX, ningu\u00e9m sabia ao certo como eram os \u00e1tomos e como eles se ligavam. Uma das teorias mais sofisticadas da \u00e9poca [&hellip;]<\/p>\n","protected":false},"author":486,"featured_media":9359,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"material-hide-sections":[],"pgc_sgb_lightbox_settings":"","_vp_format_video_url":"","_vp_image_focal_point":[],"footnotes":""},"categories":[53,86,97,111,131,306],"tags":[2032,2162,2379,2666,3136,3166],"class_list":["post-9357","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciencia","category-divulgacao-cientifica","category-engenharia-de-materiais","category-exatas","category-fisica","category-tecnologia","tag-kelvin","tag-magnetismo","tag-nanotecnologia","tag-phys-org","tag-skyrmion","tag-spintronica"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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