{"id":74583,"date":"2026-02-04T12:00:00","date_gmt":"2026-02-04T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/physiciens-changent-polarite-daimant-avec-laser-2"},"modified":"2026-02-05T01:01:19","modified_gmt":"2026-02-05T01:01:19","slug":"physiciens-changent-polarite-daimant-avec-laser-2","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/physiciens-changent-polarite-daimant-avec-laser-2","title":{"rendered":"Physiciens Changent Polarit\u00e9 D\u2019Aimant avec Laser"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span>Et si l\u2019aimantation d\u2019un mate\u0301riau pouvait e\u0302tre change\u0301e? Tout mate\u0301riau ferromagne\u0301tique a la particularite\u0301 d\u2019attirer des aimants et de s\u2019auto-aimanter en pre\u0301sence d\u2019un champ magne\u0301tique. C\u2019est notamment le cas du fer, du nickel ou du cobalt. Tous pre\u0301sentent une polarite\u0301 (orientation nord\/sud). Cette dernie\u0300re est la manifestation a\u0300 grande e\u0301chelle du phe\u0301nome\u0300ne d\u2019aimantation. Elle est une proprie\u0301te\u0301 fondamentale du mate\u0301riau magne\u0301tique et est lie\u0301e a\u0300 l\u2019alignement collectif des spins (proprie\u0301te\u0301 de rotation interne, a\u0300 la manie\u0300re d\u2019une aiguille de boussole) des e\u0301lectrons. L\u2019aimantation est habituellement modifie\u0301e en chauffant le mate\u0301riau ou en lui appliquant un champ magne\u0301tique, ce qui perturbe l\u2019arrangement commun des spins e\u0301lectroniques.<\/p>\n<p>Cependant, des physiciens ont de\u0301montre\u0301 qu\u2019il est possible de changer la polarite\u0301 autrement. Ils ont en effet utilise\u0301 un laser sur un mate\u0301riau ferromagne\u0301tique. Leur re\u0301sultat ine\u0301dit est publie\u0301 dans la revue Nature.<\/p>\n<p><b>Un mate\u0301riau au magne\u0301tisme constant<\/b><\/p>\n<p>L\u2019impulsion laser est envoye\u0301e sur du ditellurure de molybde\u0300ne (MoTe2), un mate\u0301riau ultrafin organise\u0301 comme un empilement de couches d\u2019atomes, comme les pages d\u2019un livre. Deux e\u0301tages atomiques de ce compose\u0301 chimique sont de\u0301pose\u0301s sur un wafer. Ce dernier, d\u2019une taille de quelques microme\u0300tres (un millionie\u0300me de me\u0300tres), de\u0301signe une tranche d\u2019un mate\u0301riau semi-conducteur comme le silicium. Le tellurure de molybde\u0300ne a la particularite\u0301 de former des e\u0301tats topologiques, c\u2019est-a\u0300-dire des configurations ge\u0301ome\u0301triques au niveau quantique, dicte\u0301es par les e\u0301lectrons. De tels e\u0301tats peuvent e\u0302tre assimile\u0301s a\u0300 des analogies ge\u0301ome\u0301triques (comme des anneaux), me\u0302me si ces formes ne sont pas a\u0300 prendre au sens litte\u0301ral.<\/p>\n<p>La prouesse expe\u0301rimentale re\u0301side en outre dans la capacite\u0301 a\u0300 faire passer un mate\u0301riau d\u2019isolant a\u0300 conducteur, tout en restant magne\u0301tique dans les deux cas. Cela revient a\u0300 modifier sa structure e\u0301lectronique sans de\u0301truire son ordre magne\u0301tique. \u00ab Notre expe\u0301rience nous montre clairement que l\u2019impulsion laser change l\u2019orientation collective des spins \u00bb, explique Olivier Huber, doctorant a\u0300 l\u2019Ecole polytechnique fe\u0301de\u0301rale de Zurich (Suisse) et coauteur de l\u2019e\u0301tude, dans un communique\u0301. Pour s\u2019assurer que le composant ferromagne\u0301tique change de polarite\u0301, les chercheurs ont e\u0301galement utilise\u0301 un deuxie\u0300me laser. Le faisceau lumineux se re\u0301fle\u0301chit alors sur le mate\u0301riau et fait varier les spins des e\u0301lectrons. D\u2019ou\u0300 le changement de polarite\u0301.<\/p>\n<p><b>Vers des applications prometteuses<\/b><\/p>\n<p>Cette expe\u0301rience ouvre la voie a\u0300 des applications innovantes, notamment en e\u0301lectronique et informatique quantique. \u00ab A\u0300 l\u2019avenir, la lumie\u0300re pourrait servir a\u0300 cre\u0301er a\u0300 la demande des circuits topologiques directement sur une puce \u00bb, conclut Tomasz Smolen\u0301ski, physicien expe\u0301rimental a\u0300 l\u2019universite\u0301 de Ba\u0302le (Suisse) et coauteur principal de l\u2019e\u0301tude. En d\u2019autres termes, e\u0301laborer des circuits e\u0301lectroniques qui s\u2019adaptent a\u0300 la lumie\u0300re, comme c\u2019est le cas dans des circuits quantiques.<\/p>\n<p>Une telle utilisation d\u2019un laser permettrait e\u0301galement l\u2019e\u0301laboration de minuscules interfe\u0301rome\u0300tres, des instruments permettant de mesurer des champs e\u0301lectromagne\u0301tiques extre\u0302mement faibles.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Senegal<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Senegal. Et si l\u2019aimantation d\u2019un mate\u0301riau pouvait e\u0302tre change\u0301e? Tout mate\u0301riau ferromagne\u0301tique a la particularite\u0301 d\u2019attirer des aimants et de s\u2019auto-aimanter en pre\u0301sence d\u2019un champ magne\u0301tique. C\u2019est notamment le cas du fer, du nickel ou du cobalt. Tous pre\u0301sentent une polarite\u0301 (orientation nord\/sud). Cette dernie\u0300re est la manifestation a\u0300 grande e\u0301chelle du phe\u0301nome\u0300ne [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":74582,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-74583","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Physiciens Changent Polarit\u00e9 D\u2019Aimant avec Laser - Senegal<\/title>\n<meta name=\"description\" content=\"Et si l\u2019aimantation d\u2019un mate\u0301riau pouvait e\u0302tre change\u0301e? 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