{"id":273,"date":"2021-02-18T18:07:46","date_gmt":"2021-02-18T23:07:46","guid":{"rendered":"https:\/\/sciences.ucf.edu\/physics\/afmspin\/?p=273"},"modified":"2021-09-03T13:55:47","modified_gmt":"2021-09-03T17:55:47","slug":"precessional-spin-torque-dynamics-in-biaxial-antiferromagnets","status":"publish","type":"post","link":"https:\/\/sciences.ucf.edu\/physics\/afmspin\/precessional-spin-torque-dynamics-in-biaxial-antiferromagnets\/","title":{"rendered":"Precessional spin-torque dynamics in biaxial antiferromagnets"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"273\" class=\"elementor elementor-273\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-2242c14 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"2242c14\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-50af33e\" data-id=\"50af33e\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-179b297 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"179b297\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-inner-column elementor-element elementor-element-945a5ff\" data-id=\"945a5ff\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2f9e150 elementor-widget elementor-widget-image\" data-id=\"2f9e150\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"500\" height=\"451\" src=\"https:\/\/sciences.ucf.edu\/physics\/afmspin\/wp-content\/uploads\/sites\/31\/2020\/09\/precessional-spin-torque.jpg\" class=\"attachment-large size-large wp-image-232\" alt=\"Four contour plots comparing uniaxial (left column) and biaxial (right column) behaviors. The top row shows plots of (omega_0(Theta, Phi)), while the bottom row displays (Gamma_{0,Lambda h}(Theta, Phi)).\" srcset=\"https:\/\/sciences.ucf.edu\/physics\/afmspin\/wp-content\/uploads\/sites\/31\/2020\/09\/precessional-spin-torque.jpg 500w, https:\/\/sciences.ucf.edu\/physics\/afmspin\/wp-content\/uploads\/sites\/31\/2020\/09\/precessional-spin-torque-300x271.jpg 300w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-a87559b elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"a87559b\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-inner-column elementor-element elementor-element-d0769c5\" data-id=\"d0769c5\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1be8b5f elementor-widget elementor-widget-text-editor\" data-id=\"1be8b5f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"color: #000000\">The N\u00e9el order of an antiferromagnet subject to a spin torque can undergo precession in a circular orbit about any chosen axis. The direction of the axis uniquely determines the component of spin polarization in the orbital plane required for that particular axis orientation as well as the perpendicular component of spin polarization required for stability of the precessional motion. For biaxial antiferromagnets, the orbital angular motion reduces to equation of a damped-driven pendulum, which has hysteresis versus the spin-current drive with a critical value where the period diverges. The fundamental frequency of the motion varies inversely with the damping. The stability threshold for spin current has an approximate closed-form result, which depends on the minimum cutoff frequency the orbit can support, and the damping-anisotropy parameters. The direction along the hard axis has zero cutoff frequency and the lowest threshold, and the easy axis has the highest cutoff frequency. A device setup is proposed for electrical control and detection of the dynamics, which is promising for terahertz nano-oscillators. This work has been published in PRB and can be accessed <a href=\"https:\/\/journals.aps.org\/prb\/abstract\/10.1103\/PhysRevB.103.024450\">here<\/a>.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>The N\u00e9el order of an antiferromagnet subject to a spin torque can undergo precession in a circular orbit about any chosen axis. The direction of the axis uniquely determines the <a class=\"more-link\" href=\"https:\/\/sciences.ucf.edu\/physics\/afmspin\/precessional-spin-torque-dynamics-in-biaxial-antiferromagnets\/\">Continue Reading &rarr;<\/a><\/p>\n","protected":false},"author":61,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[7],"tags":[],"class_list":["post-273","post","type-post","status-publish","format-standard","hentry","category-publications"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Precessional spin-torque dynamics in biaxial antiferromagnets -<\/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:\/\/sciences.ucf.edu\/physics\/afmspin\/precessional-spin-torque-dynamics-in-biaxial-antiferromagnets\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Precessional spin-torque dynamics in biaxial antiferromagnets -\" \/>\n<meta property=\"og:description\" content=\"The N\u00e9el order of an antiferromagnet subject to a spin torque can undergo precession in a circular orbit about any chosen axis. The direction of the axis uniquely determines the Continue Reading &rarr;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/sciences.ucf.edu\/physics\/afmspin\/precessional-spin-torque-dynamics-in-biaxial-antiferromagnets\/\" \/>\n<meta property=\"article:published_time\" content=\"2021-02-18T23:07:46+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-09-03T17:55:47+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/sciences.ucf.edu\/physics\/afmspin\/wp-content\/uploads\/sites\/31\/2020\/09\/precessional-spin-torque.jpg\" \/>\n<meta name=\"author\" content=\"Gyan Khatri\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Gyan Khatri\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" 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