{"id":24909,"date":"2025-07-16T14:47:43","date_gmt":"2025-07-16T21:47:43","guid":{"rendered":"https:\/\/dornsife.usc.edu\/news\/?p=24909"},"modified":"2025-07-31T18:14:46","modified_gmt":"2025-08-01T01:14:46","slug":"antiferromagnetic-quantum-breakthrough-detects-electron-spin","status":"publish","type":"post","link":"https:\/\/dornsife.usc.edu\/news\/stories\/antiferromagnetic-quantum-breakthrough-detects-electron-spin\/","title":{"rendered":"A quantum \u201choly grail\u201d? Tiny device controls electron spins for future tech"},"content":{"rendered":"\n\n\n    \n                                \n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--article-hero \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--article-hero\"\n    \n      >\n\n    \n<div class=\"inner-wrapper\">\n          \n<div class=\"f--field f--image\">\n\n    \n    \n    \n    \n    \n    \n              \n      <img\n                            data-src=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2025\/07\/electronspin_luo_top-768x432.jpg\"\n          data-srcset=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2025\/07\/electronspin_luo_top-1920x1080.jpg 1920w,https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2025\/07\/electronspin_luo_top-1280x720.jpg 1280w,https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2025\/07\/electronspin_luo_top-768x432.jpg 768w\"          data-sizes=\"(min-width:1200px) 75vw, (min-width:768px) 83vw, 100vw\"          class=\"lazyload\"\n        \n                  alt=\"A glowing blue ball encircled by a blue arrow appears to fly through a streaked star field\"\n        \n        \n                                      \/>\n\n    \n    \n  \n  \n\n<\/div>\n  \n      <div class=\"image-caption\">\n          \n<div class=\"f--field f--description\">\n\n    \n  A breakthrough in detecting and controlling electrons\u2019 spin paves the way for highly advanced technology. (Image: Margaret Crable via Google Gemini.)\n\n\n<\/div>\n    <\/div>\n  \n  <div class=\"text-wrapper\">\n          <nav aria-label=\"Breadcrumb\" class=\"breadcrumbs\">\n        <ul>\n                      <li><a href=\"\/news\/stories\/\">News<\/a><\/li>\n                      <li><a href=\"\/news\/stories\/\/?category=science-and-technology\">Science and Technology<\/a><\/li>\n                  <\/ul>\n      <\/nav>\n    \n              \n<div class=\"f--field f--page-title\">\n\n    \n  <h1>A quantum \u201choly grail\u201d? Tiny device controls electron spins for future tech<\/h1>\n\n\n<\/div>\n    \n          <div class=\"subtitle\">\n            \n<div class=\"f--field f--description\">\n\n    \n  Physicists with USC Dornsife and other institutions discover a better way to detect and tune antiferromagnetic resonance, paving the way for ultrafast, low-power electronics.\n\n\n<\/div>\n      <\/div>\n    \n           <strong class=\"author-field\"><span >By<\/span><a href=\"mailto:communication@dornsife.usc.edu\">USC Dornsife News<\/a><\/strong>\n    \n          <span class=\"post-date-field\">July 16, 2025<\/span>\n      <\/div>\n<\/div>\n\n\n  <\/div><\/div>\n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--social-share \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--social-share\"\n    \n      >\n\n    \n  <div class=\"content-wrapper\">\n    <span class=\"a2a_kit a2a_kit_size_32 addtoany_list\" style=\"line-height: 32px;\">\n      <span class=\"title\">\n        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fill-rule=\"evenodd\" \/>\n              <\/svg>\n            <\/span>\n            <span class=\"a2a_label visually-hidden\">Bluesky<\/span>\n          <\/a>\n                                <a class=\"a2a_button_email\" target=\"_blank\" href=\"\/#email\" rel=\"nofollow noopener\" title=\"E-mail\">\n            <span class=\"a2a_svg a2a_s__default a2a_s_print\">\n              <svg height=\"12\" viewBox=\"0 0 18 12\" width=\"18\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"m8.14285714 9.42857143c-.17142857 0-.34285714 0-.51428571.08571428l7.28571427 6.34285719c.3428572.2571428.6857143.2571428.9428572 0l7.2857142-6.34285719c-.0857142-.08571428-.2571428-.08571428-.4285714-.08571428zm-1.28571428 1.11428567v.1714286 8.5714286c0 .6857143.6 1.2857143 1.28571428 1.2857143h14.57142856c.6857143 0 1.2857143-.6 1.2857143-1.2857143v-8.5714286c0-.0857143 0-.0857143 0-.1714286l-7.2 6.3428572c-.7714286.6857143-1.8857143.6857143-2.6571429 0z\" fill-rule=\"evenodd\" transform=\"translate(-6 -9)\"\/><\/svg>\n            <\/span>\n            <span class=\"a2a_label visually-hidden\">Email<\/span>\n          <\/a>\n                  <\/span>\n  <\/div>\n\n  <\/div><\/div>\n \n\n\n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--rich-text \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--rich-text\"\n    \n      >\n\n    \n      \n<div class=\"f--field f--wysiwyg\">\n\n    \n  <p>Physicists with the USC Dornsife College of Letters, Arts and Sciences, Cornell University and collaborating institutions have created a microscopic device that can both detect and control the rapid \u201cdance\u201d of electron spins in antiferromagnetic materials \u2014 a leap that could enable a new generation of ultrafast, energy-efficient electronics.<\/p>\n<p>The work was published this month in <a href=\"https:\/\/www.science.org\/doi\/10.1126\/science.adq8590\" target=\"_blank\" rel=\"noopener\"><em>Science<\/em><\/a>.<\/p>\n<ul>\n<li>Antiferromagnetic materials are solids in which electrons spin in opposite directions, canceling each other\u2019s spin. This zero-magnetism makes them fast, stable and immune to outside magnetic interference.<\/li>\n<li>Until now, scientists could only detect this quantum behavior using bulky lab equipment \u2014 making it hard to imagine practical uses in everyday tech.<\/li>\n<\/ul>\n<p><strong>Why it matters:<\/strong> Antiferromagnets can operate at mind-boggling speeds \u2014 trillions of cycles per second \u2014 and could support real-world applications that include:<\/p>\n<ul>\n<li>Ultra-secure, lightning-fast wireless communications, well beyond 5G speeds.<\/li>\n<li>Ultra-high-resolution medical imaging.<\/li>\n<li>Safer airport security scanning without X-rays.<\/li>\n<li>Nano-oscillators that convert a static voltage to high-frequency signals, useful in a wide range of applications, including advanced computers and sensors.<\/li>\n<\/ul>\n<p>And it does all of this with a device just a few atoms thick, using only electric signals \u2014 no room-sized equipment required.<\/p>\n<p>The work was made possible by funding from the National Science Foundation and the U.S. Department of Energy \u2014 two key supporters of fundamental research driving tomorrow\u2019s technology.<\/p>\n<p><strong>The breakthrough:<\/strong> The team built a microscopic structure called a \u201ctunnel junction\u201d made of three, ultra-thin stacked layers of materials. This tiny device can do two key things:<\/p>\n<ol>\n<li>Detect antiferromagnetic resonance \u2014 the natural vibration of opposing electron spins.<\/li>\n<li>Tune that resonance electrically using a force called spin-orbit torque, which nudges the electron spins into motion.<\/li>\n<\/ol>\n<p><strong>What they\u2019re saying: <\/strong>\u201cThis gives us a quantum-scale stethoscope and control knob in one,\u201d said <a href=\"https:\/\/dornsife.usc.edu\/profile\/kelly-luo\/\">Kelly Luo<\/a>, co-corresponding author and Gabilan Assistant Professor of <a href=\"https:\/\/dornsife.usc.edu\/physics\/\">Physics and Astronomy<\/a>, <a href=\"https:\/\/dornsife.usc.edu\/chemistry\/\">Chemistry<\/a>, and Chemical Engineering and Materials Science at USC Dornsife. \u201cWe\u2019re able to listen to the spin dynamics \u2014 and then dial them up or down \u2014 using nothing but electric current.\u201d<\/p>\n<ul>\n<li>Luo holds a joint appointment at the <a href=\"https:\/\/viterbischool.usc.edu\/\" target=\"_blank\" rel=\"noopener\">USC Viterbi School of Engineering<\/a>.<\/li>\n<\/ul>\n<p><strong>How it\u2019s different:<\/strong> Previous methods for detecting antiferromagnetic behavior relied on bulky lab equipment and relatively large materials. This new device works at the micron scale \u2014 roughly 1,000 times smaller \u2014 making it the most compact, electrically tunable platform yet.<\/p>\n<ul>\n<li>\u201cWe\u2019ve shrunk the technology down to a size that makes practical applications possible,\u201d said <a href=\"https:\/\/physics.cornell.edu\/daniel-ralph\" target=\"_blank\" rel=\"noopener\">Daniel Ralph<\/a>, co-corresponding author and R. Newman Professor of Physics in Cornell\u2019s <a href=\"https:\/\/as.cornell.edu\/education\" target=\"_blank\" rel=\"noopener\">College of Arts and Sciences<\/a>. \u201cThat\u2019s what makes this so exciting.\u201d<\/li>\n<\/ul>\n<div style=\"float: right; padding: 20px;\">\n<iframe loading=\"lazy\" width=\"315\" height=\"560\" src=\"https:\/\/www.youtube.com\/embed\/3vf38wAQSvo\"\ntitle=\"YouTube video player\" aria-hidden=\"true\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe><\/div>\n<p><strong>A clever twist:<\/strong> At first, the team couldn\u2019t tell which of the two magnetic layers was responsible for the signal \u2014 their behaviors were too closely linked.<\/p>\n<p>Their solution? Twist the layers ever so slightly to break the symmetry. That allowed them to target just one layer with electric current while leaving the other unaffected.<\/p>\n<p>\u201cIt was like trying to separate the sound of two violins playing the same note,\u201d said lead author Thow Min Jerald Cham, formerly at Cornell and now David and Ellen Lee Postdoctoral Scholar at Caltech. \u201cThat tiny shift helped us tell them apart and control each one individually.\u201d<\/p>\n<p><strong>What\u2019s next? <\/strong>The researchers plan to develop nano-oscillators based on their device \u2014 tiny components that generate ultra-fast signals for applications in medical imaging, scientific instruments, telecommunications, quantum computing and more.<\/p>\n<ul>\n<li>They also want to explore \u201cnegative damping\u201d \u2014 a phenomenon where, instead of fading out, the spin oscillations actually gain energy. That could allow the device to act as a powerful, terahertz radiation source in a footprint smaller than a grain of sand.<\/li>\n<\/ul>\n<p><strong>About the study<\/strong><\/p>\n<p>In addition to Luo, Ralph and Cham, study authors include Xiaoxi Huang of Cornell; Daniel Chica and Xavier Roy of Columbia University; and Kenji Watanabe and Takashi Taniguchi of Japan\u2019s National Institute for Materials Science.<\/p>\n<p><em>Read more on the Cornell University College of Letters, Arts and Sciences\u2019 <\/em><a href=\"https:\/\/as.cornell.edu\/news\/physicists-take-step-toward-holy-grail-electron-spins\" target=\"_blank\" rel=\"noopener\"><em>news website<\/em><\/a><em>.<\/em><\/p>\n<hr \/>\n<p><em>Editor\u2019s Note: Darrin S. Joy and Jim Key contributed to this article along with Linda B. Glaser of Cornell.<\/em><\/p>\n\n\n\n<\/div>\n\n\n  <\/div><\/div>\n\n\n\n  \n        \n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--article-related-stories \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--article-related-stories\"\n    \n      >\n\n    \n  <div class=\"inner-wrapper\">\n              \n<div class=\"f--field f--section-title\">\n\n    \n  <h2>\n          Related Articles\n      <\/h2>\n\n\n<\/div>\n    \n                  <article>\n              \n<div class=\"f--field f--cta-title\">\n\n    \n  <h3>\n          <a href=\"https:\/\/dornsife.usc.edu\/news\/stories\/cosmic-measurements-of-gravity-support-dark-matter\/\" \n                        class=\"\" \n      >Scientists test a fundamental rule of gravity on cosmic scales \u2014 and it holds up<\/a>\n      <\/h3>\n\n\n<\/div>\n        <\/article>\n              <article>\n              \n<div class=\"f--field f--cta-title\">\n\n    \n  <h3>\n          <a href=\"https:\/\/dornsife.usc.edu\/news\/stories\/santec-usa-corporation-funds-fellowships-for-physics-research\/\" \n                        class=\"\" \n      >New fellowship empowers future physicists to explore quantum frontier<\/a>\n      <\/h3>\n\n\n<\/div>\n        <\/article>\n              <article>\n              \n<div class=\"f--field f--cta-title\">\n\n    \n  <h3>\n          <a href=\"https:\/\/dornsife.usc.edu\/news\/stories\/why-are-some-stars-always-visible-while-others-come-and-go-with-seasons\/\" \n                        class=\"\" \n      >Why are some stars always visible while others come and go with the\u00a0seasons?<\/a>\n      <\/h3>\n\n\n<\/div>\n        <\/article>\n            <\/div>\n\n\n  <\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Physicists with USC Dornsife, Cornell University and other institutions discover a better way to detect and tune antiferromagnetic resonance, paving the way for ultrafast, low-power electronics.<\/p>\n","protected":false},"author":13,"featured_media":24912,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[16],"tags":[216,60],"class_list":["post-24909","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science-and-technology","tag-physics-and-astronomy","tag-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>A quantum \u201choly grail\u201d? Tiny device controls electron spins for future tech<\/title>\n<meta name=\"description\" content=\"Physicists discover a way to detect and tune antiferromagnetic resonance, paving the way for ultrafast, low-power electronics\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dornsife.usc.edu\/news\/stories\/antiferromagnetic-quantum-breakthrough-detects-electron-spin\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Quantum tech \u201choly grail\u201d? Tiny device controls electron spins\" \/>\n<meta property=\"og:description\" content=\"Physicists discover a way to detect and tune antiferromagnetic resonance, paving the way for ultrafast, low-power electronics\" \/>\n<meta property=\"og:url\" content=\"https:\/\/dornsife.usc.edu\/news\/stories\/antiferromagnetic-quantum-breakthrough-detects-electron-spin\/\" \/>\n<meta property=\"og:site_name\" content=\"USC Dornsife News\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/uscdornsife\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-16T21:47:43+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-01T01:14:46+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2025\/07\/electronspin_luo_top.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2000\" \/>\n\t<meta property=\"og:image:height\" content=\"1150\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Michael Liu\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@uscdornsife\" \/>\n<meta name=\"twitter:site\" content=\"@uscdornsife\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/dornsife.usc.edu\/news\/stories\/antiferromagnetic-quantum-breakthrough-detects-electron-spin\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/dornsife.usc.edu\/news\/stories\/antiferromagnetic-quantum-breakthrough-detects-electron-spin\/\"},\"author\":{\"name\":\"Michael Liu\",\"@id\":\"https:\/\/dornsife.usc.edu\/news\/#\/schema\/person\/d03084ed5319ed7575c96017879a7447\"},\"headline\":\"A quantum \u201choly grail\u201d? 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