{"id":3849,"date":"2015-04-06T11:25:51","date_gmt":"2015-04-06T11:25:51","guid":{"rendered":"http:\/\/revoscience.com\/en\/?p=3849"},"modified":"2015-04-06T11:25:51","modified_gmt":"2015-04-06T11:25:51","slug":"putting-the-heat-on-magnetic-recording","status":"publish","type":"post","link":"https:\/\/www.revoscience.com\/en\/putting-the-heat-on-magnetic-recording\/","title":{"rendered":"Putting the heat on magnetic recording"},"content":{"rendered":"

Detailed experiments reveal the operational parameters for a promising thermo-magnetic data-storage technology<\/strong><\/em><\/p>\n

\"download<\/a>The mechanics and dynamics of heat-assisted magnetic recording (HAMR) are now better understood thanks to work by A*STAR and the National University of Singapore [1]. The experimental study will help scientists aiming to break the areal density barrier of current magnetic hard disk technology.<\/span>

Today\u2019s hard disk drives record and store data in minute magnetic domains on a spinning magnetic platter. As the magnetic domains become smaller, the thermal noise rises rapidly, making it increasingly difficult to record data reliably. HAMR is a promising future data storage scheme that uses a more stable magnetic medium, in combination with local heating, to achieve more reliable magnetization switching.<\/span>

\u201cHAMR can be implemented with magnetic grains as small as 3 nanometers and higher magnetic anisotropy, which will make it possible to store magnetic information at recording densities beyond a terabyte per square inch,\u201d says research leader Yunjie Chen from A*STAR\u2019s Data Storage Institute.<\/span>

Theoretical simulations have demonstrated the potential of HAMR but also the possibility of density-limiting electrical noise and problematic non-reversal of magnetic domains in the recording process. Chen\u2019s team designed some experiments to probe the dynamics of HAMR.<\/span>

\u201cFor practical application of HAMR, it is important to understand the thermo-magnetic reversal process and recording performance, including magnetization dynamics and effects that limit areal density,\u201d says Chen.<\/span>

The experimental HAMR recording system devised by Chen\u2019s team consisted of an array of magnetic islands of multilayer cobalt and palladium. Preparing this device involved sputtering multiple atomic layers of different combinations of elements, then patterning the device using electron-beam lithography to produce magnetic islands of about 50 nanometers in size (see image). The team then used far-field laser heating with a thermal spot size of about 1.5 micrometers in combination with a magnetic field to simulate the magnetization switching of the HAMR process. They observed the resultant magnetization patterns using a high-resolution magnetic force microscope.<\/span>

Chen\u2019s team showed that when the material was laser heated to near its Curie temperature \u2014 the temperature at which the material\u2019s permanent magnetism is overcome by an external magnetic field \u2014 the strength of the magnetic field required to induce complete magnetic switching was about 13 per cent of the intrinsic magnetic \u2018coercivity\u2019 of the islands. Surprisingly, however, the team also discovered that, due to thermal fluctuations, the optimal temperature for recording is slightly lower than the Curie temperature.<\/span>

Chen explains that the results provide critical operational parameters for the practical implementation of HAMR data storage technology.<\/span>

The A*STAR-affiliated researchers contributing to this research are from the Data Storage Institute and the Institute of Materials Research and Engineering<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Detailed experiments reveal the operational parameters for a promising thermo-magnetic data-storage technology The mechanics and dynamics of heat-assisted magnetic recording (HAMR) are now better understood thanks to work by A*STAR and the National University of Singapore [1]. The experimental study will help scientists aiming to break the areal density barrier of current magnetic hard disk […]<\/p>\n","protected":false},"author":6,"featured_media":3850,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"class_list":["post-3849","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research"],"featured_image_urls":{"full":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/download-11.jpg",297,170,false],"thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/download-11-150x150.jpg",150,150,true],"medium":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/download-11.jpg",297,170,false],"medium_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/download-11.jpg",297,170,false],"large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/download-11.jpg",297,170,false],"1536x1536":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/download-11.jpg",297,170,false],"2048x2048":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/download-11.jpg",297,170,false],"ultp_layout_landscape_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/download-11.jpg",297,170,false],"ultp_layout_landscape":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/download-11.jpg",297,170,false],"ultp_layout_portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/download-11.jpg",297,170,false],"ultp_layout_square":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/download-11.jpg",297,170,false],"newspaper-x-single-post":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/download-11.jpg",297,170,false],"newspaper-x-recent-post-big":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/download-11.jpg",297,170,false],"newspaper-x-recent-post-list-image":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/download-11.jpg",95,54,false],"web-stories-poster-portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/download-11.jpg",297,170,false],"web-stories-publisher-logo":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/download-11.jpg",96,55,false],"web-stories-thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/download-11.jpg",150,86,false]},"author_info":{"info":["Amrita Tuladhar"]},"category_info":"Research<\/a>","tag_info":"Research","comment_count":"0","_links":{"self":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/3849","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=3849"}],"version-history":[{"count":0,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/3849\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media\/3850"}],"wp:attachment":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media?parent=3849"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/categories?post=3849"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/tags?post=3849"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}