{"id":80,"date":"2007-10-17T00:54:04","date_gmt":"2007-10-17T05:54:04","guid":{"rendered":"http:\/\/arxivblog.com\/?p=80"},"modified":"2007-10-17T01:16:10","modified_gmt":"2007-10-17T06:16:10","slug":"magnetic-cloaking","status":"publish","type":"post","link":"http:\/\/arxivblog.com\/?p=80","title":{"rendered":"Magnetic cloaking"},"content":{"rendered":"<p>The world has gone crazy over metamaterials cos they can be used to build invisibility cloaks, as ya&#8217;ll saw <a href=\"http:\/\/arxivblog.com\/?p=59\">just the other week<\/a>.  There&#8217;s usually some drawback the media coverage never tells ya which means that we ain&#8217;t gonna see no Harry Potter-type invisibility cloaks any time soon. But that hasn&#8217;t stopped the living God of metamaterials, John &#8220;Now-You-See-Him&#8221; Pendry at Imperial College in London UK, from dreamin up ever more ingenious designs.<\/p>\n<p>This week, he and a few pals have gone and built a metamaterial that works for light with zero frequency. That&#8217;s egghead-talk for a magnetic field.   The material is a thin layer of lead squares pasted onto a cover slip and cooled to superconducting temperatures. This actually prevents a magnetic field from passing through it.<\/p>\n<p>Why would anybody need a  metamaterial  that screens magnetic fields?   There are all kindsa researchers playin around with tiny magnetic fields or with experiments in which they don&#8217;t want no magnetism at all. Their work is swamped by larger fields nearby. So a magnetic field cloak might be a useful device to have around.<\/p>\n<p>And unlike other cloaking ideas, the technology is up and running now.<\/p>\n<p>Ref: <a href=\"http:\/\/arxiv.org\/abs\/0710.1227\">arxiv.org\/abs\/0710.1227<\/a>: A DC Magnetic Metamaterial<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The world has gone crazy over metamaterials cos they can be used to build invisibility cloaks, as ya&#8217;ll saw just the other week. There&#8217;s usually some drawback the media coverage never tells ya which means that we ain&#8217;t gonna see no Harry Potter-type invisibility cloaks any time soon. But that hasn&#8217;t stopped the living God [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,11],"tags":[],"class_list":["post-80","post","type-post","status-publish","format-standard","hentry","category-buzzwords","category-cold-n-cool"],"_links":{"self":[{"href":"http:\/\/arxivblog.com\/index.php?rest_route=\/wp\/v2\/posts\/80","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/arxivblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/arxivblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/arxivblog.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/arxivblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=80"}],"version-history":[{"count":0,"href":"http:\/\/arxivblog.com\/index.php?rest_route=\/wp\/v2\/posts\/80\/revisions"}],"wp:attachment":[{"href":"http:\/\/arxivblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=80"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/arxivblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=80"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/arxivblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=80"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}