{"id":13638,"date":"2017-11-15T06:17:22","date_gmt":"2017-11-15T06:17:22","guid":{"rendered":"https:\/\/www.revoscience.com\/en\/?p=13638"},"modified":"2017-11-15T06:17:22","modified_gmt":"2017-11-15T06:17:22","slug":"molecular-magnetism-packs-power-messenger-electron","status":"publish","type":"post","link":"https:\/\/www.revoscience.com\/en\/molecular-magnetism-packs-power-messenger-electron\/","title":{"rendered":"Molecular magnetism packs power with \u201cmessenger electron\u201d"},"content":{"rendered":"
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Berry suggests that the new molecular magnet structure could be used in advanced computing, super-cold research, or further exploring the fundamentals of magnetism. DAVID TENENBAUM<\/figcaption><\/figure>\n

Electrons can be a persuasive bunch, or at least, a talkative bunch, according to new work from John Berry\u2019s lab at the University of Wisconsin\u2013Madison.<\/span><\/p>\n

The spins of unpaired electrons are the root of permanent magnetism, and after 10 years of design and re-design, Berry\u2019s lab has made a molecule that gains magnetic strength through an unusual way of controlling those spins.<\/span><\/p>\n

Berry says the new structure that graduate student Jill Chipman created could lead to a breakthrough in quantam computing, an approach with such great potential that it could undermine today\u2019s silicon-based supercomputers much as the telephone did the telegraph: A great leap forward that begins a slide into irrelevance.<\/span><\/p>\n

The presence and activity, or \u201cspin,\u201d of unpaired electrons sets the strength of a permanent magnet, so molecules with a high degree of spin are a desirable target for chemists. The unusually large spin in the new magnetic molecule, Berry explains, results from a \u201cmessenger electron\u201d that shuttles between an unpaired electron at each end of the rod-shaped molecule and persuades all three of them to adopt the same spin.<\/span><\/p>\n

That agreement of spin, \u201corthogonality\u201d in the jargon, adds strength to a permanent magnet.<\/span><\/p>\n

Berry, a UW\u2013Madison professor of chemistry, notes that in other materials, a traveling electron tends to oppose the spins of magnetic centers, reducing the magnetic strength. In Chipman\u2019s new creation, however, the messenger electron is focused on harmony: like a traveling social worker, it causes the two remote unpaired electrons to take the same spin, adding strength and\/or durability.<\/span><\/p>\n

The new molecule, described in Chemistry \u2013 A European Journal, contains carbon, nickel, chlorine, nitrogen, and molybdenum, but lacks the costly rare earth elements that have bedeviled efforts to commercialize super-strong new magnets. Its structure suggests that the molecule could be formed into a polymer \u2013 a repeating chain of units like those found in plastics \u2013 raising the possibility of cheaper, stronger magnets.<\/span><\/p>\n

\u201cWe tried to remove electrons from this molecule 10 years ago so it had an unpaired electron at each end, but did not get far,\u201d Berry says. \u201cWe since learned that this made a chemical that is really temperature-sensitive, so Jill had to develop a low-temperature process that relies on dry ice to cool it to -78 degrees C.\u201d<\/span><\/p>\n

The \u201ctraveling social worker\u201d electron establishes \u201ca design principle that could be used to create many new magnetic molecules that behave as little bar magnets,\u201d Berry says.<\/span><\/p>\n

The discovery was also enabled by the arrival last summer an instrument called a SQUID magnetometer (Superconducting QUantam Interference Device) that can measure magnetism with great accuracy down to below 2 degrees above absolute zero.<\/span><\/p>\n

Much of the focus of magnet innovation concerns greater strength, Berry says, \u201cbut there are all sorts of things people look for. We need both permanent magnets and those with ephemeral magnetization for different technical reasons. Magnets are widespread in ultra-cold refrigeration, motors, computer hard drives and electronic circuits.\u201d<\/span><\/p>\n

By going the next step, and miniaturizing magnets to a single molecule, that could enable quantam computing, Berry says. Quantam computing could be especially beneficial to chemists, who confront staggering complexity in trying to model the chemical reactions that are their bread and butter.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Electrons can be a persuasive bunch, or at least, a talkative bunch, according to new work from John Berry\u2019s lab at the University of Wisconsin\u2013Madison. The spins of unpaired electrons are the root of permanent magnetism, and after 10 years of design and re-design, Berry\u2019s lab has made a molecule that gains magnetic strength through […]<\/p>\n","protected":false},"author":6,"featured_media":13639,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[43,17],"tags":[],"class_list":["post-13638","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-computer-science","category-research"],"featured_image_urls":{"full":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/11\/berry-1-775x730-1.jpg",775,730,false],"thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/11\/berry-1-775x730-1-150x150.jpg",150,150,true],"medium":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/11\/berry-1-775x730-1-300x283.jpg",300,283,true],"medium_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/11\/berry-1-775x730-1-768x723.jpg",750,706,true],"large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/11\/berry-1-775x730-1.jpg",750,706,false],"1536x1536":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/11\/berry-1-775x730-1.jpg",775,730,false],"2048x2048":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/11\/berry-1-775x730-1.jpg",775,730,false],"ultp_layout_landscape_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/11\/berry-1-775x730-1.jpg",775,730,false],"ultp_layout_landscape":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/11\/berry-1-775x730-1.jpg",605,570,false],"ultp_layout_portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/11\/berry-1-775x730-1.jpg",600,565,false],"ultp_layout_square":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/11\/berry-1-775x730-1.jpg",600,565,false],"newspaper-x-single-post":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/11\/berry-1-775x730-1.jpg",520,490,false],"newspaper-x-recent-post-big":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/11\/berry-1-775x730-1.jpg",382,360,false],"newspaper-x-recent-post-list-image":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/11\/berry-1-775x730-1.jpg",69,65,false],"web-stories-poster-portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/11\/berry-1-775x730-1.jpg",640,603,false],"web-stories-publisher-logo":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/11\/berry-1-775x730-1.jpg",96,90,false],"web-stories-thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/11\/berry-1-775x730-1.jpg",150,141,false]},"author_info":{"info":["Amrita Tuladhar"]},"category_info":"Computer Science<\/a> Research<\/a>","tag_info":"Research","comment_count":"0","_links":{"self":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/13638","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/comments?post=13638"}],"version-history":[{"count":0,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/13638\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media\/13639"}],"wp:attachment":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media?parent=13638"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/categories?post=13638"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/tags?post=13638"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}