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Here, we decouple the propulsion and head\u2010to\u2010head repulsion in chemically powered micromotors, enabling highly ordered flocking. The micromotors are Janus SiO\n                    <jats:sub>2<\/jats:sub>\n                    microspheres of 10\u00a0\u00b5m in diameter with a Ni\/PtO bilayer cap, where the PtO layer propels the motor toward its cap in H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    and the Ni layer generates in\u2010plane magnetic dipolar repulsion between the caps. This head\u2010to\u2010head repulsion creates the alignment critical for flocking. Under a perpendicular magnetic field (\n                    <jats:italic>B<\/jats:italic>\n                    <jats:sub>\u22a5<\/jats:sub>\n                    ) of \u223c20 mT, micromotors moving at 10\u201320\u00a0\u00b5m\/s form coherent flocks spanning up to 20 particle diameters, with a flocking order parameter\n                    <jats:italic>P<\/jats:italic>\n                    <jats:sub>local<\/jats:sub>\n                    approaching unity. Because propulsion and alignment are independently tunable, the system exhibits reconfigurable transitions among disordered gas, cluster, polar cluster, and flocking states as functions of magnetic field strength, particle density, and propulsion speed, consistent with Brownian dynamics simulations. Weak in\u2010plane magnetic fields\n                    <jats:italic>B\u2225<\/jats:italic>\n                    further enable the steering of the flock and reconfigure it as microfluidic valves. This work establishes a framework for engineering emergent collective behaviors in chemically powered micromotors by engineering their pairwise interactions.\n                  <\/jats:p>","DOI":"10.1002\/smll.76146","type":"journal-article","created":{"date-parts":[[2026,10,9]],"date-time":"2026-10-09T13:04:49Z","timestamp":1791551089000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Interaction Engineering Enables Reconfigurable Flocking in Chemical Micromotors"],"prefix":"10.1002","author":[{"given":"Zhiying","family":"Yi","sequence":"first","affiliation":[{"name":"School of Materials Science and Engineering Harbin Institute of Technology (Shenzhen)  Shenzhen Guangdong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dezhou","family":"Cao","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Harbin Institute of Technology (Shenzhen)  Shenzhen Guangdong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2248-4806","authenticated-orcid":false,"given":"Xing","family":"Ma","sequence":"additional","affiliation":[{"name":"Sauvage Laboratory for Smart Materials School of Integrated Circuits Harbin Institute of Technology (Shenzhen)  Shenzhen Guangdong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4163-3173","authenticated-orcid":false,"given":"Wei","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Harbin Institute of Technology (Shenzhen)  Shenzhen Guangdong 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