{"id":54907,"date":"2022-02-28T13:50:32","date_gmt":"2022-02-28T12:50:32","guid":{"rendered":"https:\/\/aktuelles.uni-frankfurt.de\/?p=54907"},"modified":"2023-02-17T13:23:19","modified_gmt":"2023-02-17T12:23:19","slug":"spintronics-innovative-crystals-for-future-computer-electronics","status":"publish","type":"post","link":"https:\/\/aktuelles.uni-frankfurt.de\/en\/english\/spintronics-innovative-crystals-for-future-computer-electronics\/","title":{"rendered":"Spintronics: Innovative crystals for future computer electronics"},"content":{"rendered":"<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><a href=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2022\/02\/beitragsbild_Spintronik.jpg\"><img fetchpriority=\"high\" decoding=\"async\" width=\"650\" height=\"450\" src=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2022\/02\/beitragsbild_Spintronik.jpg\" alt=\"\" class=\"wp-image-54871\" srcset=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2022\/02\/beitragsbild_Spintronik.jpg 650w, https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2022\/02\/beitragsbild_Spintronik-300x208.jpg 300w\" sizes=\"(max-width: 650px) 100vw, 650px\" \/><\/a><figcaption>Researchers at Goethe University develop novel materials to minimize power consumption of electronic elements. Photo: raigvi\/Shutterstock<\/figcaption><\/figure><\/div>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><strong>Computer chips and storage elements are expected to function as quickly as possible and be energy-saving at the same time. Innovative spintronic modules are at an advantage here thanks to their high speed and efficiency, as there is no lossy electrical current, rather the electrons couple with one another magnetically \u2013 like a series of tiny magnetic needles which interact with almost no friction loss. A team of scientists involving Goethe University Frankfurt and the Fritz Haber Institute in Berlin has now found promising properties with crystals grown from rare-earth atoms, which offer hope on the long path towards usage as spintronic components.<\/strong><\/p>\n\n\n\n<p>While modern computers are already very fast, they also consume vast amounts of electricity. For some years now a new technology has been much talked about, which although it is still in its infancy could one day revolutionise computer technology \u2013 spintronics. The word is a portmanteau meaning \u201cspin\u201d and \u201celectronics\u201d, because with these components electrons no longer flow through computer chips, but the spin of the electrons serves as the information carrier. A team of researchers with staff from Goethe University Frankfurt has now identified materials that have surprisingly fast properties for spintronics. The results have been published in the specialist magazine \u201cNature Materials\u201d.<\/p>\n\n\n\n<p>\u201cYou have to imagine the electron spins as if they were tiny magnetic needles which are attached to the atoms of a crystal lattice and which communicate with one another,\u201d says Cornelius Krellner, Professor for Experimental Physics at Goethe University Frankfurt. How these magnetic needles react with one another fundamentally depends on the properties of the material. To date ferromagnetic materials have been examined in spintronics above all; with these materials \u2013 similarly to iron magnets \u2013 the magnetic needles prefer to point in one direction. In recent years, however, the focus has been placed on so-called antiferromagnets to a greater degree, because these materials are said to allow for even faster and more efficient switchability than other spintronic materials.<\/p>\n\n\n\n<p>With antiferromagnets the neighbouring magnetic needles always point in opposite directions. If an atomic magnetic needle is pushed in one direction, the neighbouring needle turns to face in the opposite direction. This in turn causes the next but one neighbour to point in the same direction as the first needle again. \u201cAs this interplay takes place very quickly and with virtually no friction loss, it offers considerable potential for entirely new forms of electronic componentry,\u201d explains Krellner.<\/p>\n\n\n\n<p>Above all crystals with atoms from the group of rare earths are regarded as interesting candidates for spintronics as these comparatively heavy atoms have strong magnetic moments \u2013 chemists call the corresponding states of the electrons 4<em>f<\/em> orbitals. Among the rare-earth metals \u2013 some of which are neither rare nor expensive \u2013 are elements such as praseodymium and neodymium, which are also used in magnet technology. The research team has now studied seven materials with differing rare-earth atoms in total, from praseodymium to holmium.<\/p>\n\n\n\n<p>The problem in the development of spintronic materials is that perfectly designed crystals are required for such components as the smallest discrepancies immediately have a negative impact on the overall magnetic order in the material. This is where the expertise in Frankfurt came into play. \u201cThe rare earths melt at about 1000 degrees Celsius, but the rhodium that is also needed for the crystal does not melt until about 2000 degrees Celsius,\u201d says Krellner. \u201cThis is why customary crystallisation methods do not function here.\u201d<\/p>\n\n\n\n<p>Instead the scientists used hot indium as a solvent. The rare earths, as well as the rhodium and silicon that are required, dissolve in this at about 1500 degrees Celsius. The graphite crucible was kept at this temperature for about a week and then gently cooled. As a result the desired crystals grew in the form of thin disks with an edge length of two to three millimetres. These were then studied by the team with the aid of X-rays produced on the Berlin synchrotron BESSY II and on the Swiss Light Source of the Paul Scherrer Institute in Switzerland.<\/p>\n\n\n\n<p>\u201cThe most important finding is that in the crystals which we have grown the rare-earth atoms react magnetically with one another very quickly and that the strength of these reactions can be specifically adjusted through the choice of atoms,\u201d says Krellner. This opens up the path for further optimisation \u2013 ultimately spintronics is still purely fundamental research and years away from the production of commercial components.<\/p>\n\n\n\n<p>There are still a great many problems to be solved on the path to market maturity, however. Thus, the crystals \u2013 which are produced in blazing heat \u2013 only deliver convincing magnetic properties at temperatures of less than minus 170 degrees Celsius. \u201cWe suspect that the operating temperatures can be raised significantly by adding iron atoms or similar elements,\u201d says Krellner. \u201cBut it remains to be seen whether the magnetic properties are then just as positive.\u201d Thanks to the new results the researchers now have a better idea of where it makes sense to change parameters, however.<strong><\/strong><\/p>\n\n\n\n<p class=\"has-background\" style=\"background-color:#eeeeee\"><strong>Publication: <\/strong>Y. W. Windsor, S.-E. Lee, D. Zahn, V. Borisov, D. Thonig, K. Kliemt, A. Ernst, C. Sch\u00fc\u00dfler-Langeheine, N. Pontius, U. Staub, C. Krellner, D. V. Vyalikh, O. Eriksson, L. Rettig:<strong> Exchange scaling of ultrafast angular momentum transfer in 4f antiferromagnets.<\/strong> Nature Materials (2022) <a href=\"https:\/\/www.nature.com\/articles\/s41563-022-01206-4\">https:\/\/www.nature.com\/articles\/s41563-022-01206-4<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Computer chips and storage elements are expected to function as quickly as possible and be energy-saving at the same time. Innovative spintronic modules are at an advantage here thanks to [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":54871,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"footnotes":""},"categories":[126,254],"tags":[242],"post_folder":[],"class_list":["post-54907","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-english","category-research","tag-physics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Spintronics: Innovative crystals for future computer electronics | Aktuelles aus der Goethe-Universit\u00e4t Frankfurt<\/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:\/\/aktuelles.uni-frankfurt.de\/en\/english\/spintronics-innovative-crystals-for-future-computer-electronics\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Spintronics: Innovative crystals for future computer electronics | Aktuelles aus der Goethe-Universit\u00e4t Frankfurt\" \/>\n<meta property=\"og:description\" content=\"Computer chips and storage elements are expected to function as quickly as possible and be energy-saving at the same time. 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