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Here, alternating\u2010current (AC) driven magnetization reversal is demonstrated in a semi\u2010magnetic topological insulator (Cr,Bi,Sb)\n                    <jats:sub>2<\/jats:sub>\n                    Te\n                    <jats:sub>3<\/jats:sub>\n                    \/(Bi,Sb)\n                    <jats:sub>2<\/jats:sub>\n                    Te\n                    <jats:sub>3<\/jats:sub>\n                    , facilitated by a low threshold current density of 1.5 \u00d7 10\n                    <jats:sup>9<\/jats:sup>\n                    \u2005A\u2005m\n                    <jats:sup>\u22122<\/jats:sup>\n                    . Time\u2010domain Hall voltage measurements using an oscilloscope reveal a strongly nonlinear and rectified Hall response during the magnetization reversal process. Fourier analysis of the time\u2010varying Hall voltage identifies higher\u2010harmonic signals and a rectified direct\u2010current (DC) component, highlighting the complex interplay among the applied current, external magnetic field, and magnetization dynamics. Furthermore, a hysteretic behavior in the current\u2010voltage characteristics gives rise to frequency mixing under dual\u2010frequency excitation. This effect, distinct from conventional polynomial\u2010based nonlinearities, allows for selective extraction of specific frequency components. The results demonstrate that AC excitation can not only switch magnetization efficiently but also induce tunable nonlinear responses, offering a new pathway for multifunctional spintronic devices with potential applications in energy\u2010efficient memory, signal processing, and frequency conversion.\n                  <\/jats:p>","DOI":"10.1002\/adma.202506210","type":"journal-article","created":{"date-parts":[[2025,10,14]],"date-time":"2025-10-14T12:53:45Z","timestamp":1760446425000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["AC Current\u2010Driven Magnetization Switching and Nonlinear Hall Rectification in a Magnetic Topological Insulator"],"prefix":"10.1002","volume":"38","author":[{"given":"Yuto","family":"Kiyonaga","sequence":"first","affiliation":[{"name":"Department of Applied Physics and Quantum\u2010Phase Electronics Center (QPEC) The University of Tokyo  Tokyo 113\u20108656 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