{"id":16633,"date":"2023-08-28T04:40:44","date_gmt":"2023-08-28T04:40:44","guid":{"rendered":"https:\/\/bemagnet.com\/?p=16633"},"modified":"2023-08-28T04:40:44","modified_gmt":"2023-08-28T04:40:44","slug":"materiais-magneticos","status":"publish","type":"post","link":"https:\/\/bemagnet.com\/pt\/magnetic-materials\/","title":{"rendered":"14 tipos de materiais magn\u00e9ticos que precisa de conhecer"},"content":{"rendered":"<p>um campo atrativo ou repulsivo. Os objectos que s\u00e3o atra\u00eddos por um \u00edman s\u00e3o chamados materiais magn\u00e9ticos.<\/p>\n<p>Mais uma vez, nem todos os materiais s\u00e3o naturalmente magn\u00e9ticos. H\u00e1 certos tipos de materiais que requerem modifica\u00e7\u00f5es especiais. Ao mesmo tempo, existem alguns materiais que n\u00e3o s\u00e3o magn\u00e9ticos.<\/p>\n<p>Eis alguns materiais magn\u00e9ticos comuns:<\/p>\n<h2>Tipos de Magnetismo<\/h2>\n<h3>1. Paramagnetismo<\/h3>\n<p>O paramagnetismo \u00e9 uma forma de magnetismo que \u00e9 fracamente atra\u00eddo por um campo magn\u00e9tico criado externamente. Este tipo de magnetismo s\u00f3 pode ser exibido por materiais paramagn\u00e9ticos. <a href=\"https:\/\/en.wikipedia.org\/wiki\/Paramagnetism\">Materiais paramagn\u00e9ticos<\/a> s\u00e3o constitu\u00eddos por dipolos at\u00f3micos permanentes que correm paralelamente na mesma dire\u00e7\u00e3o que o campo externo.<\/p>\n<p>Quando o campo magn\u00e9tico externo \u00e9 removido, os materiais paramagn\u00e9ticos perdem as suas propriedades magn\u00e9ticas. No entanto, os electr\u00f5es n\u00e3o emparelhados continuar\u00e3o a existir. Devido \u00e0 sua baixa suscetibilidade positiva, os materiais paramagn\u00e9ticos s\u00e3o atra\u00eddos por outros \u00edmanes, mas n\u00e3o podem atrair outros materiais paramagn\u00e9ticos.<\/p>\n<figure id=\"attachment_16634\" aria-describedby=\"caption-attachment-16634\" style=\"width: 619px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-16634 size-full\" src=\"https:\/\/bemagnet.com\/wp-content\/uploads\/2023\/08\/Figure-1-Paramagnetism.jpg\" alt=\"Paramagnetismo\" width=\"619\" height=\"341\" \/><figcaption id=\"caption-attachment-16634\" class=\"wp-caption-text\">Paramagnetismo<\/figcaption><\/figure>\n<p>Outra carater\u00edstica do paramagnetismo \u00e9 o facto de ser sens\u00edvel \u00e0 temperatura. Um aumento da temperatura diminui os momentos magn\u00e9ticos dos seus \u00e1tomos.<\/p>\n<p>S\u00f3 \u00e9 poss\u00edvel saber se um material magn\u00e9tico \u00e9 paramagn\u00e9tico ou n\u00e3o observando a sua configura\u00e7\u00e3o eletr\u00f3nica. Um material paramagn\u00e9tico tem electr\u00f5es n\u00e3o emparelhados (um n\u00famero \u00edmpar de electr\u00f5es). Alguns exemplos de materiais que exibem paramagnetismo incluem o tit\u00e2nio, o oxig\u00e9nio, o alum\u00ednio, etc.<\/p>\n<h3>2. Ferromagnetismo<\/h3>\n<p><a href=\"http:\/\/hyperphysics.phy-astr.gsu.edu\/hbase\/Solids\/ferro.html\">Ferromagnetismo<\/a> \u00e9 uma forma de magnetismo em que o material magn\u00e9tico atrai ou \u00e9 fortemente atra\u00eddo por outros materiais magn\u00e9ticos. Um material ferromagn\u00e9tico \u00e9 magnetizado quando exposto a um campo magn\u00e9tico externo. Em campos magn\u00e9ticos mais fortes, os materiais ferromagn\u00e9ticos podem ser magnetizados at\u00e9 ao limite de satura\u00e7\u00e3o.<\/p>\n<figure id=\"attachment_16635\" aria-describedby=\"caption-attachment-16635\" style=\"width: 613px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-16635\" src=\"https:\/\/bemagnet.com\/wp-content\/uploads\/2023\/08\/figure-2-ferromagnetism.jpg\" alt=\"Ferromagnetismo\" width=\"613\" height=\"431\" \/><figcaption id=\"caption-attachment-16635\" class=\"wp-caption-text\">Ferromagnetismo<\/figcaption><\/figure>\n<p>A remo\u00e7\u00e3o de um campo magn\u00e9tico externo n\u00e3o lhes retira as propriedades ferromagn\u00e9ticas. Os materiais ferromagn\u00e9ticos s\u00e3o tamb\u00e9m sens\u00edveis a temperaturas superiores ao seu ponto de curie. Ap\u00f3s este ponto, perdem o seu magnetismo. No entanto, ao arrefecerem, recuperam as suas propriedades magn\u00e9ticas.<\/p>\n<p>O n\u00famero de i\u00f5es de \u00e1tomos num material ferromagn\u00e9tico cria mesmo um campo magn\u00e9tico a partir do interior do material. Por conseguinte, os materiais ferromagn\u00e9ticos t\u00eam momentos magn\u00e9ticos duradouros. Alguns exemplos de materiais ferromagn\u00e9ticos incluem: cobalto, n\u00edquel, ferro e algumas das suas ligas.<\/p>\n<h3>3. Antiferromagnetismo<\/h3>\n<p><a href=\"https:\/\/www.britannica.com\/science\/antiferromagnetism\">Antiferromagnetismo<\/a> \u00e9 uma forma de magnetismo em que os \u00e1tomos de um material est\u00e3o dispostos uniformemente, mas movendo-se na dire\u00e7\u00e3o oposta \u00e0 dos \u00e1tomos adjacentes. Os materiais antiferromagn\u00e9ticos t\u00eam qualidades \u00fanicas que podem ser utilizadas em aplica\u00e7\u00f5es como o armazenamento de dados, sensores e spintr\u00f3nica.<\/p>\n<figure id=\"attachment_16636\" aria-describedby=\"caption-attachment-16636\" style=\"width: 620px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-16636\" src=\"https:\/\/bemagnet.com\/wp-content\/uploads\/2023\/08\/figure-3-antiferromagnetc-arrangement-atomic-spins.jpg\" alt=\"Arranjo Antiferromagn\u00e9tico Espiras At\u00f3micas\" width=\"620\" height=\"426\" \/><figcaption id=\"caption-attachment-16636\" class=\"wp-caption-text\">Arranjo Antiferromagn\u00e9tico Espiras At\u00f3micas<\/figcaption><\/figure>\n<p>Quando materiais antiferromagn\u00e9ticos s\u00e3o expostos a temperaturas abaixo do ponto Neel, eles perdem suas propriedades antiferromagn\u00e9ticas. Tornam-se materiais paramagn\u00e9ticos.<\/p>\n<p>Alguns exemplos de materiais antiferromagn\u00e9ticos incluem: \u00f3xido de ferro, \u00f3xido de mangan\u00eas, cr\u00f3mio, \u00f3xido de cobre (II) e \u00f3xido de n\u00edquel (II).<\/p>\n<h3>4. <a href=\"https:\/\/www.sciencedirect.com\/topics\/materials-science\/ferrimagnetism\">Ferrimagnetismo<\/a><\/h3>\n<p>Existem materiais magn\u00e9ticos com:<\/p>\n<ul>\n<li>Pode atrair outros \u00edmanes<\/li>\n<li>Os campos magn\u00e9ticos externos tamb\u00e9m podem atrair estes materiais<\/li>\n<\/ul>\n<p>Idealmente, estes s\u00e3o materiais magn\u00e9ticos \u00fanicos que apresentam propriedades ferromagn\u00e9ticas e antiferromagn\u00e9ticas. Al\u00e9m disso, quando expostos a temperaturas extremamente elevadas (acima da temperatura de curie), perdem as propriedades magn\u00e9ticas externas.<\/p>\n<p>Ao arrefecerem, recuperam o seu ferrimagnetismo, tornando-os permanentemente magn\u00e9ticos.<\/p>\n<figure id=\"attachment_16637\" aria-describedby=\"caption-attachment-16637\" style=\"width: 622px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-16637 size-full\" src=\"https:\/\/bemagnet.com\/wp-content\/uploads\/2023\/08\/figure-4-ferrimagnetism-overview.jpg\" alt=\"Vis\u00e3o geral do ferrimagnetismo\" width=\"622\" height=\"416\" \/><figcaption id=\"caption-attachment-16637\" class=\"wp-caption-text\">Vis\u00e3o geral do ferrimagnetismo<\/figcaption><\/figure>\n<p>Geralmente, o ferrimagnetismo ocorre principalmente em ferrites (um tipo de \u00f3xido magn\u00e9tico). Alguns exemplos de materiais ferrimagn\u00e9ticos s\u00e3o a granada de \u00edtrio e ferro, a trevorite, a magnesioferrite e a magnetite.<\/p>\n<h3>5. Diamagnetismo<\/h3>\n<p>O diamagnetismo \u00e9 uma ocorr\u00eancia em que alguns materiais, quando expostos a um campo magn\u00e9tico externo, tendem a afastar-se do campo. Naturalmente, todos os materiais s\u00e3o diamagn\u00e9ticos. No entanto, alguns materiais t\u00eam propriedades magn\u00e9ticas mais fortes do que a sua natureza diamagn\u00e9tica.<\/p>\n<figure id=\"attachment_16638\" aria-describedby=\"caption-attachment-16638\" style=\"width: 614px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-16638 size-full\" src=\"https:\/\/bemagnet.com\/wp-content\/uploads\/2023\/08\/figure-5-Diamagnetism.jpg\" alt=\"Diamagnetismo\" width=\"614\" height=\"429\" \/><figcaption id=\"caption-attachment-16638\" class=\"wp-caption-text\">Diamagnetismo<\/figcaption><\/figure>\n<p>Os materiais diamagn\u00e9ticos n\u00e3o exibem quaisquer propriedades magn\u00e9ticas naturalmente, apenas contrariam um campo magn\u00e9tico externo repelindo-o.<\/p>\n<h2>Exemplos pr\u00e1ticos de materiais magn\u00e9ticos<\/h2>\n<div class=\"ast-oembed-container\" style=\"height: 100%;\"><iframe loading=\"lazy\" title=\"Tra\u00e7ando linhas de campo magn\u00e9tico GCSE Physics Required Practical\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/NWUgK8W-4JM?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<h3><\/h3>\n<h3>6. Ferro<\/h3>\n<p>O ferro \u00e9 um metal d\u00factil e male\u00e1vel, de cor cinzenta e capaz de conduzir calor e eletricidade. O ferro e as suas ligas formam \u00edmanes fortes e s\u00e3o tamb\u00e9m atra\u00eddos por outros \u00edmanes.<\/p>\n<p>Os materiais ferromagn\u00e9ticos, como o ferro, s\u00e3o utilizados em v\u00e1rias aplica\u00e7\u00f5es, incluindo: transformadores, motores el\u00e9ctricos, armazenamento magn\u00e9tico, geradores, etc.<\/p>\n<h3>7. N\u00edquel<\/h3>\n<p>O n\u00edquel \u00e9 um metal d\u00factil e male\u00e1vel com elevada resist\u00eancia \u00e0 corros\u00e3o. \u00c9 utilizado no fabrico de moedas e turbinas a g\u00e1s.<\/p>\n<p>O n\u00edquel obt\u00e9m as suas propriedades magn\u00e9ticas a partir dos electr\u00f5es livres na sua camada mais externa. O n\u00edquel pertence aos materiais ferromagn\u00e9ticos porque pode atrair e ser atra\u00eddo por materiais magn\u00e9ticos.<\/p>\n<h3>8. \u00c9rbio<\/h3>\n<p>O \u00e9rbio \u00e9 um material male\u00e1vel que \u00e9 utilizado principalmente no fabrico de barras de controlo para reactores nucleares.<\/p>\n<p>As propriedades magn\u00e9ticas do \u00e9rbio mudam consoante a temperatura. A temperaturas superiores a 85 K, o \u00e9rbio \u00e9 paramagn\u00e9tico. A temperaturas entre 20 e 85 K, o \u00e9rbio \u00e9 antiferromagn\u00e9tico. Torna-se ferromagn\u00e9tico a temperaturas inferiores a 20 K.<\/p>\n<h3>9. Germ\u00e2nio<\/h3>\n<p>O germ\u00e2nio \u00e9 um metaloide duro e quebradi\u00e7o com uma estrutura cristalina como a do diamante. Outra propriedade \u00fanica do germ\u00e2nio \u00e9 o facto de se expandir ao congelar.<\/p>\n<p>O germ\u00e2nio pertence ao grupo IV com propriedades diamagn\u00e9ticas. No entanto, estas propriedades magn\u00e9ticas podem mudar consoante os n\u00edveis de temperatura.<\/p>\n<h3>10. T\u00e9rbio<\/h3>\n<p>O t\u00e9rbio \u00e9 um metal d\u00factil com poucas aplica\u00e7\u00f5es comerciais devido ao seu elevado custo. O t\u00e9rbio apresenta propriedades ferromagn\u00e9ticas a temperaturas at\u00e9 221 K. A temperaturas superiores a 228 K, o t\u00e9rbio apresenta propriedades paramagn\u00e9ticas.<\/p>\n<h3>11. Cobalto<\/h3>\n<p>O cobalto \u00e9 um metal est\u00e1vel na \u00e1gua e no ar e \u00e9 utilizado principalmente em baterias de i\u00f5es de l\u00edtio. Tamb\u00e9m \u00e9 utilizado no fabrico de \u00edmanes duros e macios.<\/p>\n<p>O cobalto \u00e9 um material ferromagn\u00e9tico, uma vez que \u00e9 fortemente atra\u00eddo por outros \u00edmanes devido aos seus tr\u00eas electr\u00f5es em movimento livre.<\/p>\n<h3>12. Neod\u00edmio<\/h3>\n<p>O neod\u00edmio \u00e9 um metal duro prateado com fortes propriedades magn\u00e9ticas. \u00c9 um material ferromagn\u00e9tico; \u00e9 magnetizado por outros \u00edmanes. Os materiais de neod\u00edmio s\u00e3o os \u00edmanes mais fortes do mundo e podem atrair 1.000 vezes mais peso do que o seu pr\u00f3prio.<\/p>\n<p>Os \u00edmanes de neod\u00edmio s\u00e3o utilizados em aplica\u00e7\u00f5es como auscultadores, microfones e altifalantes.<\/p>\n<h3>13. Sam\u00e1rio<\/h3>\n<p>O sam\u00e1rio \u00e9 um metal est\u00e1vel \u00e0 temperatura ambiente e ocorre naturalmente numa cor branca prateada. O elemento sam\u00e1rio forma um \u00edman mais forte quando combinado com o cobalto. O sam\u00e1rio \u00e9 utilizado como absorvente de neutr\u00f5es em reactores nucleares e em aplica\u00e7\u00f5es de absor\u00e7\u00e3o de infravermelhos.<\/p>\n<h3>14. Magnetite<\/h3>\n<p>A magnetite \u00e9 um dos materiais mais magn\u00e9ticos que existem. \u00c9 tamb\u00e9m conhecida como lodestone e ocorre naturalmente na cor preta e cinzenta. A magnetite \u00e9 utilizada principalmente no fabrico de a\u00e7o. Outras aplica\u00e7\u00f5es da magnetite incluem: fabrico de amon\u00edaco, tintas e cer\u00e2mica, etc.<\/p>\n<h2>Conclus\u00e3o<\/h2>\n<p><a href=\"https:\/\/bemagnet.com\/pt\/leis-do-magnetismo-101\/\">Magnetismo<\/a> \u00e9 um fen\u00f3meno natural e a maioria dos metais naturais tem propriedades magn\u00e9ticas. No entanto, alguns metais t\u00eam propriedades magn\u00e9ticas mais fortes do que outros, os materiais ferromagn\u00e9ticos s\u00e3o \u00edmanes mais fortes.<\/p>\n<p>Geralmente, para al\u00e9m dos materiais ferromagn\u00e9ticos, os outros elementos magn\u00e9ticos s\u00f3 podem ser detectados em laborat\u00f3rio utilizando detectores magn\u00e9ticos. Al\u00e9m disso, os n\u00e3o-metais n\u00e3o t\u00eam quaisquer propriedades magn\u00e9ticas.<\/p>","protected":false},"excerpt":{"rendered":"<p>an attractive or repulsive field. Objects that get attracted by a magnet are called magnetic materials. Again, not all materials are naturally magnetic. There are certain types of material that require special modifications. At the same time, there are some that are non-magnetic materials. Here are some common magnetic materials: Types of Magnetism 1. Paramagnetism [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16639,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","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":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"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-opacity":"","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-opacity":"","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-opacity":"","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-opacity":"","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-opacity":"","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-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-16633","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>14 Types of Magnetic Materials You need to Know<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/bemagnet.com\/pt\/materiais-magneticos\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"14 Types of Magnetic Materials You need to Know\" \/>\n<meta property=\"og:description\" content=\"an attractive or repulsive field. 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