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However, processing speed has plateaued in the nanosecond regime, as further acceleration demands excessively large write power. We demonstrate ultralow power in picosecond switching using heterostructures of the antiferromagnet Mn\n                    <jats:sub>3<\/jats:sub>\n                    Sn and heavy metal tantalum, which exhibit spin-orbit torque switching by electrical pulses as short as 40 picoseconds. Power consumption in the picosecond regime is several orders of magnitude lower than in ferromagnetic counterparts owing to efficient angular momentum transfer. Compared with previously reported picosecond switching devices, our ultralow-power switching device realizes much less heating, higher endurance, and switching using photocurrent. These results pave the way to ultrafast nonvolatile memory and efficient optical-to-electrical conversion technology.\n                  <\/jats:p>","DOI":"10.1126\/science.adt3136","type":"journal-article","created":{"date-parts":[[2026,5,14]],"date-time":"2026-05-14T18:14:14Z","timestamp":1778782454000},"page":"761-765","update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":5,"title":["Picosecond ultralow-power switching device based on an antiferromagnet"],"prefix":"10.1126","volume":"392","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-1450-9695","authenticated-orcid":true,"given":"Hanshen","family":"Tsai","sequence":"first","affiliation":[{"name":"Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo, 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Fujita, Field-free, spin-current control of magnetization in non-collinear chiral antiferro-magnets. physica status solidi (RRL)\u2013. Rapid Research Letters 11, 1600360 (2017).","journal-title":"Rapid Research Letters"},{"key":"e_1_3_2_57_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41567-024-02476-2"},{"key":"e_1_3_2_58_2","unstructured":"H. Tsai T. Matsuda K. Kondou K. Shimizu T. Nomoto T. Higo T. Matsuo Y. Tsushima M. Asakura H. Peng D. Nishio-Hamane S. Yamada R. Tang T. Iizuka S. Miwa R. Arita M. Takenaka S. 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