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However, there are still materials challenges to overcome, including the integration into advanced silicon electronics and the scarce resources of constituent heavy elements of those materials. Through magneto\u2010transport measurements and first\u2010principles calculations, here robust spin\u2013orbit coupling (SOC)\u2010induced properties of a ferromagnetic topological surface state in FeSi and their controllability via hybridization with adjacent materials are demonstrated. In comparison to the case of its naturally oxidized surface, the ferromagnetic transition temperature is greatly increased beyond room temperature and the effective SOC strength is almost doubled at the surface in proximity to a wide\u2010bandgap fluoride insulator. Those enhanced magnetic properties enable room\u2010temperature magnetization switching, being applicable to spin\u2013orbit torque based spintronic devices. Realization of strong SOC in the noble\u2010metal\u2010free silicon\u2010based compound will accelerate spintronic applications.<\/jats:p>","DOI":"10.1002\/adma.202206801","type":"journal-article","created":{"date-parts":[[2022,11,5]],"date-time":"2022-11-05T02:00:25Z","timestamp":1667613625000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["A Noble\u2010Metal\u2010Free Spintronic System with Proximity\u2010Enhanced Ferromagnetic Topological Surface State of FeSi above Room Temperature"],"prefix":"10.1002","volume":"35","author":[{"given":"Tomohiro","family":"Hori","sequence":"first","affiliation":[{"name":"Department of Applied Physics The University of Tokyo  Hongo 7\u20103\u20101, Bunkyo\u2010ku Tokyo 113\u20108656 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3270-2915","authenticated-orcid":false,"given":"Naoya","family":"Kanazawa","sequence":"additional","affiliation":[{"name":"Department of Applied Physics The University of Tokyo  Hongo 7\u20103\u20101, Bunkyo\u2010ku Tokyo 113\u20108656 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Motoaki","family":"Hirayama","sequence":"additional","affiliation":[{"name":"Department of Applied Physics The University of Tokyo  Hongo 7\u20103\u20101, Bunkyo\u2010ku Tokyo 113\u20108656 Japan"},{"name":"RIKEN Center for Emergent Matter Science (CEMS)  Hirosawa 2\u20101, Wako Saitama 351\u20100198 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kohei","family":"Fujiwara","sequence":"additional","affiliation":[{"name":"Institute for Materials Research Tohoku University  Katahira 2\u20101\u20101, Aoba\u2010ku, Sendai Miyagi 980\u20108577 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Atsushi","family":"Tsukazaki","sequence":"additional","affiliation":[{"name":"Institute for Materials Research Tohoku University  Katahira 2\u20101\u20101, Aoba\u2010ku, Sendai Miyagi 980\u20108577 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Masakazu","family":"Ichikawa","sequence":"additional","affiliation":[{"name":"Department of Applied Physics The University of Tokyo  Hongo 7\u20103\u20101, Bunkyo\u2010ku Tokyo 113\u20108656 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Masashi","family":"Kawasaki","sequence":"additional","affiliation":[{"name":"Department of Applied Physics The University of Tokyo  Hongo 7\u20103\u20101, Bunkyo\u2010ku Tokyo 113\u20108656 Japan"},{"name":"RIKEN Center for Emergent Matter Science (CEMS)  Hirosawa 2\u20101, Wako Saitama 351\u20100198 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoshinori","family":"Tokura","sequence":"additional","affiliation":[{"name":"Department of Applied Physics The University of Tokyo  Hongo 7\u20103\u20101, Bunkyo\u2010ku Tokyo 113\u20108656 Japan"},{"name":"RIKEN Center for Emergent Matter Science (CEMS)  Hirosawa 2\u20101, Wako Saitama 351\u20100198 Japan"},{"name":"Tokyo College University of Tokyo  Hongo 7\u20103\u20101, Bunkyo\u2010ku Tokyo 113\u20108656 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2022,12,20]]},"reference":[{"key":"e_1_2_8_1_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature19820"},{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/nmat4360"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1103\/RevModPhys.82.3045"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1038\/s42254-018-0011-5"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1038\/natrevmats.2016.44"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1038\/natrevmats.2017.31"},{"key":"e_1_2_8_7_1","first-page":"1109","volume":"2","author":"Rashba E. 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