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Thin films of AFMs are particularly promising for practical applications due to their compatibility with spin\u2010orbit torque (SOT) mechanisms. However, studying these thin films presents challenges, primarily due to the weak signals they produce and the rapid dynamics driven by SOT, that are too fast for conventional electric transport or microwave techniques to capture. The time\u2010resolved magneto\u2010optical Kerr effect (TR\u2010MOKE) has been a successful tool for probing antiferromagnetic dynamics in bulk materials, thanks to its sub\u2010picosecond (sub\u2010ps) time resolution. Yet, its application to nanometer\u2010scale thin films has been limited by the difficulty of detecting weak signals in such small volumes. In this study, the first successful observation of antiferromagnetic dynamics are presented in nanometer\u2010thick orthoferrite films using the pump\u2010probe technique to detect TR\u2010MOKE signal. This paper report an exceptionally low damping constant of 1.5 \u00d7 10<jats:sup>\u22124<\/jats:sup> and confirms the AFM magnonic nature of these dynamics through angular\u2010dependent measurements. Furthermore, it is observed that electrical currents can potentially modulate these dynamics via SOT. The\u00a0findings lay the groundwork for developing tunable, energy\u2010efficient spintronic devices, paving the way for advancements in next\u2010generation spintronic applications.<\/jats:p>","DOI":"10.1002\/adma.202417240","type":"journal-article","created":{"date-parts":[[2025,1,27]],"date-time":"2025-01-27T02:43:57Z","timestamp":1737945837000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Observation of Real\u2010Time Spin\u2010Orbit Torque Driven Dynamics in Antiferromagnetic Thin Film"],"prefix":"10.1002","volume":"37","author":[{"given":"Yang","family":"Cheng","sequence":"first","affiliation":[{"name":"Department of Electrical and Computer Engineering, and Department of Physics and Astronomy University of California  Los Angeles CA 90095 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hanshen","family":"Huang","sequence":"additional","affiliation":[{"name":"Department of Electrical 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