{"id":335,"date":"2021-09-02T19:28:49","date_gmt":"2021-09-02T23:28:49","guid":{"rendered":"https:\/\/sciences.ucf.edu\/physics\/afmspin\/?p=335"},"modified":"2022-10-04T15:28:16","modified_gmt":"2022-10-04T19:28:16","slug":"theoretical-study-of-coherent-spin-pumping-and-thz-spin-torque-oscillator-in-a-series-of-easy-plane-antiferromagnets","status":"publish","type":"post","link":"https:\/\/sciences.ucf.edu\/physics\/afmspin\/theoretical-study-of-coherent-spin-pumping-and-thz-spin-torque-oscillator-in-a-series-of-easy-plane-antiferromagnets\/","title":{"rendered":"Theoretical study of coherent spin pumping and THz spin-torque oscillator in a series of easy-plane antiferromagnets"},"content":{"rendered":"<p>Coherent spin pumping at THz frequency range was recently reported in antiferromagnets with easy-axis anisotropy such as MnF<sub>2<\/sub> and Cr<sub>2<\/sub>O<sub>3<\/sub>. However, easy-plane antiferromagnets such as NiO, which are much easier to make, were considered to be bad candidates because the N\u00e9el vector is linearly polarized, placing a major restriction on the choice of materials for real applications. Cheng\u2019s group challenged this seemingly established conclusion by showing that easy-plane antiferromagnets can pump dc spin currents with the help of either a magnetic field or the Dzyaloshinskii-Moriya interaction (DMI), and the amplitude can be as strong as their easy-axis counterparts. Collaborating with the Nanoscale Quantum Sensing Lab at UCSD, it has been demonstrated both theoretically and experimentally that bulk single-crystal hematite ( -Fe<sub>2<\/sub>O<sub>3<\/sub>) can pump dc spin current at room temperature thanks to the DMI. Furthermore, it has been predicted that NiO (and similar oxides) can pump dc spin current via the resonance of the acoustic antiferromagnetic mode (around 0.1 THz) when a magnetic field below 5T is applied along the easy axis. As a reciprocal effect, Cheng\u2019s group predicted that the threshold current density required to excite auto-oscillation of NiO can be suppressed by 1~2 order of magnitude by a moderate magnetic field below the spin-flop transition. The reduced threshold does not come at the price of compromised frequency, paving the way to ultrafast spin-torque oscillator with low energy consumption.<\/p>\n<p>This work has been published as two papers, in Physical Review Letters, available <a href=\"https:\/\/journals.aps.org\/prl\/abstract\/10.1103\/PhysRevLett.127.117202\">here<\/a>, and in Physical Review Applied, <a href=\"https:\/\/journals.aps.org\/prresearch\/abstract\/10.1103\/PhysRevResearch.4.033139\">here<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Coherent spin pumping at THz frequency range was recently reported in antiferromagnets with easy-axis anisotropy such as MnF2 and Cr2O3. However, easy-plane antiferromagnets such as NiO, which are much easier <a class=\"more-link\" href=\"https:\/\/sciences.ucf.edu\/physics\/afmspin\/theoretical-study-of-coherent-spin-pumping-and-thz-spin-torque-oscillator-in-a-series-of-easy-plane-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-335","post","type-post","status-publish","format-standard","hentry","category-publications"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Theoretical study of coherent spin pumping and THz spin-torque oscillator in a series of easy-plane 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\/theoretical-study-of-coherent-spin-pumping-and-thz-spin-torque-oscillator-in-a-series-of-easy-plane-antiferromagnets\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Theoretical study of coherent spin pumping and THz spin-torque oscillator in a series of easy-plane antiferromagnets -\" \/>\n<meta property=\"og:description\" content=\"Coherent spin pumping at THz frequency range was recently reported in antiferromagnets with easy-axis anisotropy such as MnF2 and Cr2O3. However, easy-plane antiferromagnets such as NiO, which are much easier Continue Reading &rarr;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/sciences.ucf.edu\/physics\/afmspin\/theoretical-study-of-coherent-spin-pumping-and-thz-spin-torque-oscillator-in-a-series-of-easy-plane-antiferromagnets\/\" \/>\n<meta property=\"article:published_time\" content=\"2021-09-02T23:28:49+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-10-04T19:28:16+00:00\" \/>\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=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" 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