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Given the reliance of conventional SOT devices on magnetic fields, achieving field\u2010free magnetization switching is a prerequisite for the advancement toward high\u2010density integration. While harnessing low\u2010symmetry materials enables switching without field via unconventional spin currents, however, this approach faces an intrinsic trade\u2010off where the introduction of out\u2010of\u2010plane spin polarization compromises the dominant in\u2010plane component, resulting in prohibitive critical current. Here, this study achieves the reconciliation of symmetry breaking and high driving efficiency of Pt through a solution based on a Mn\n                    <jats:sub>3<\/jats:sub>\n                    Sn\/Pt\/Co trilayer. Upon identifying Mn\n                    <jats:sub>3.03<\/jats:sub>\n                    Sn\n                    <jats:sub>0.97<\/jats:sub>\n                    as the optimal composition through precise co\u2010sputtering tuning, field\u2010free switching with a ratio of 54% is demonstrated at a low critical current density of 3.86\u00d710\n                    <jats:sup>6<\/jats:sup>\n                    A cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    . Observing that a substantial decay and subsequent vanishing of the field\u2010free switching ratio upon increasing Pt thickness or introducing insulating MgO barriers, accompanied by a reversal in switching polarity. This supports an elastic spin scattering mechanism where the non\u2010collinear spin texture in Mn\n                    <jats:sub>3<\/jats:sub>\n                    Sn reorients Pt spin polarization. Crucially, this generates the out\u2010of\u2010plane component without sacrificing dominant in\u2010plane polarization, enabling efficient field\u2010free switching. This study highlights a scalable pathway for energy\u2010efficient spintronic devices.\n                  <\/jats:p>","DOI":"10.1002\/smll.75598","type":"journal-article","created":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T05:40:12Z","timestamp":1788241212000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Reorientation of Spin Polarization in Pt via Elastic Spin Scattering for Efficient Magnetization Switching in Mn\n                    <sub>3<\/sub>\n                    Sn\/Pt\/Co Trilayer"],"prefix":"10.1002","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-5768-9027","authenticated-orcid":false,"given":"Minggao","family":"Zuo","sequence":"first","affiliation":[{"name":"School of Materials Science and Engineering University of Science and Technology Beijing  Beijing 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