{"id":1052,"date":"2019-02-10T00:13:28","date_gmt":"2019-02-09T16:13:28","guid":{"rendered":"https:\/\/labstt.phy.ncu.edu.tw\/?p=1052"},"modified":"2019-02-10T00:15:13","modified_gmt":"2019-02-09T16:15:13","slug":"dual-control-of-giant-field-like-spin-torque-in-spin-filter-tunnel-junctions","status":"publish","type":"post","link":"https:\/\/labstt.phy.ncu.edu.tw\/en\/archives\/1052","title":{"rendered":"Dual Control of Giant Field-like Spin Torque in Spin Filter Tunnel Junctions"},"content":{"rendered":"<p>We predict a giant field-like spin torque, T\u22a5, in spin-filter (SF) barrier tunnel junctions in sharp contrast to existing junctions based on nonmagnetic passive barriers. We demonstrate that T\u22a5 has linear bias behavior, is independent of the SF thickness, and has odd parity with respect to the SF\u2019s exchange splitting. Thus, it can be selectively controlled via external bias or external magnetic field which gives rise to sign reversal of T\u22a5 via magnetic field switching. <!--more-->The underlying mechanism is the interlayer exchange coupling between the noncollinear magnetizations of the SF and free ferromagnetic electrode via the nonmagnetic insulating (I) spacer giving rise to giant spin-dependent reflection at the SF\/I interface. These findings suggest that the proposed field-like-spin-torque MRAM may provide promising dual functionalities for both \u2018reading\u2019 and \u2018writing\u2019 processes which requirelower critical current densities and faster writing and reading speeds.<\/p>\r\n<br>\r\n[1] Y. \u2013H. Tang et al., Sci. Rep. 5, 11341 (2015)\r\n<br>\r\n[2] Y. \u2013H. Tang et al., Phys. Rev. B 96, 064429 (2017).\r\n<br>\r\n<img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-1056\" src=\"https:\/\/labstt.phy.ncu.edu.tw\/wp-content\/uploads\/2019\/02\/Image-award__YHTang_SF-MTJ.png\" alt=\"\" width=\"2591\" height=\"1729\" \/>","protected":false},"excerpt":{"rendered":"We predict a giant field-like spin torque, T\u22a5, in spin-filter (SF) barrier tunnel junctions in sharp contrast to existing junctions based on nonmagnetic passive barriers. We demonstrate that T\u22a5 has linear bias behavior, is independent of the SF thickness, and has odd parity with respect to the SF\u2019s exchange splitting. Thus, it can be selectively [&#8230;]<p><a class=\"btn btn-secondary understrap-read-more-link\" href=\"https:\/\/labstt.phy.ncu.edu.tw\/en\/archives\/1052\">Read More&#8230;<span class=\"screen-reader-text\"> from Dual Control of Giant Field-like Spin Torque in Spin Filter Tunnel Junctions<\/span><\/a><\/p>","protected":false},"author":1,"featured_media":754,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[18],"tags":[],"class_list":["post-1052","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-newest-research"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Dual Control of Giant Field-like Spin Torque in Spin Filter Tunnel Junctions &#060; Theoretical and Computational Spintronics Group<\/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:\/\/labstt.phy.ncu.edu.tw\/en\/archives\/1052\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dual Control of Giant Field-like Spin Torque in Spin Filter Tunnel Junctions &#060; Theoretical and Computational Spintronics Group\" \/>\n<meta property=\"og:description\" content=\"We predict a giant field-like spin torque, T\u22a5, in spin-filter (SF) barrier tunnel junctions in sharp contrast to existing junctions based on nonmagnetic passive barriers. 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