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Magnetic control has a superior advantage for fast and remotely controlled deployment; however, a significant drawback is needed to maintain the magnetic force to hold the transformation, limiting its use in structural applications. The shape\u2010locking property of shape\u2010memory polymers (SMPs) can resolve this issue. However, the intrinsic irreversibility of SMPs may limit their reconfigurability as active metamaterials. Moreover, to date, reprogrammable methods have required high power with laser and arc welding proving to be energy\u2010inefficient control methods. In this work, a magneto\u2010thermomechanical tool is constructed and demonstrated, which enables a single material system to transform with untethered, reversible, low\u2010powered reprogrammable deformations, and shape locking via the application of magneto\u2010thermomechanically triggered prestress on the SMP and structural instability with asymmetric magnetic torque. The mutual assistance of two physics concepts\u2014magnetic control combined with the thermomechanical behavior of SMPs\u00a0is demonstrated, without requiring new materials synthesis and high\u2010power energy for reprogramming. This approach can open a new path of active metamaterials, flexible yet stiff soft robots, multimodal morphing structures, and mechanical computing devices where it can be designed in reversible and reprogrammable ways.<\/jats:p>","DOI":"10.1002\/adma.202207349","type":"journal-article","created":{"date-parts":[[2022,11,17]],"date-time":"2022-11-17T04:32:07Z","timestamp":1668659527000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":83,"title":["Magneto\u2010Thermomechanically Reprogrammable Mechanical Metamaterials"],"prefix":"10.1002","volume":"35","author":[{"given":"Bihui","family":"Zou","sequence":"first","affiliation":[{"name":"UM\u2010SJTU Joint Institute Shanghai Jiao Tong University  800 Dongchuan Road Shanghai 200240 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zihe","family":"Liang","sequence":"additional","affiliation":[{"name":"UM\u2010SJTU Joint Institute Shanghai Jiao Tong University  800 Dongchuan Road Shanghai 200240 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dijia","family":"Zhong","sequence":"additional","affiliation":[{"name":"UM\u2010SJTU Joint Institute Shanghai Jiao Tong University  800 Dongchuan Road Shanghai 200240 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiming","family":"Cui","sequence":"additional","affiliation":[{"name":"UM\u2010SJTU Joint Institute Shanghai Jiao Tong University  800 Dongchuan Road Shanghai 200240 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kai","family":"Xiao","sequence":"additional","affiliation":[{"name":"UM\u2010SJTU Joint Institute Shanghai Jiao Tong University  800 Dongchuan Road Shanghai 200240 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuang","family":"Shao","sequence":"additional","affiliation":[{"name":"UM\u2010SJTU Joint Institute Shanghai Jiao Tong University  800 Dongchuan Road Shanghai 200240 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6442-2972","authenticated-orcid":false,"given":"Jaehyung","family":"Ju","sequence":"additional","affiliation":[{"name":"UM\u2010SJTU Joint Institute Shanghai Jiao Tong University  800 Dongchuan Road Shanghai 200240 China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,12,29]]},"reference":[{"key":"e_1_2_10_1_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41586-018-0185-0"},{"key":"e_1_2_10_1_2","doi-asserted-by":"publisher","DOI":"10.1126\/scirobotics.aax7044"},{"key":"e_1_2_10_1_3","doi-asserted-by":"publisher","DOI":"10.1038\/s41586-021-03698-7"},{"key":"e_1_2_10_1_4","doi-asserted-by":"publisher","DOI":"10.1038\/nmat4544"},{"key":"e_1_2_10_1_5","doi-asserted-by":"publisher","DOI":"10.1038\/natrevmats.2017.66"},{"key":"e_1_2_10_1_6","doi-asserted-by":"publisher","DOI":"10.1109\/JMEMS.2004.825308"},{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsami.9b13840"},{"key":"e_1_2_10_2_2","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.2013292117"},{"key":"e_1_2_10_2_3","doi-asserted-by":"publisher","DOI":"10.1021\/acsami.0c13863"},{"key":"e_1_2_10_2_4","doi-asserted-by":"publisher","DOI":"10.1038\/nature25443"},{"key":"e_1_2_10_2_5","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.1608193113"},{"key":"e_1_2_10_2_6","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.abc6414"},{"key":"e_1_2_10_2_7","first-page":"31","author":"Montgomery S. 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