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Achieving robust oscillations requires lowering the threshold current (Ith), governed by the spin Hall efficiency (\u03b8SH). Conventional approaches to enhance \u03b8SH often involve trade-offs, such as increased resistivity and interfacial effects. Here, we demonstrate a pronounced enhancement of the bulk spin Hall effect in PtBi alloys via crystallographic engineering, achieving a 3-fold increase in \u03b8SH from 0.07 in Pt100.0Bi0.0 to 0.24 in Pt94.0Bi6.0 and 0.19 in Pt91.3Bi8.7, extracted from DC-bias spin-torque ferromagnetic resonance. The enhancement arises from bulk-dominated extrinsic side-jump scattering. Correspondingly, Ith is reduced by 42% and 32% in 100 nm SHNOs based on Co40Fe40B20(3 nm)\/Pt94.0Bi6.0(4 nm) and Co40Fe40B20(3 nm)\/Pt91.3Bi8.7(4 nm), respectively. The devices exhibit narrower linewidths (\u223c25 MHz), enhanced quality factors (350 \u2264 Q \u2264 550, \u223c4\u00d7 higher than Pt (Pt100.0Bi0.0)), and a 61.6% reduction in threshold power. These findings establish PtBi alloys as efficient spin Hall materials, enabling reduced power consumption for SHNO-based neuromorphic and memory technologies.<\/jats:p>","DOI":"10.1021\/acsami.6c06092","type":"journal-article","created":{"date-parts":[[2026,7,13]],"date-time":"2026-07-13T17:30:46Z","timestamp":1783963846000},"page":"39941-39951","source":"Crossref","is-referenced-by-count":0,"title":["Bulk\nSpin\u2013Orbit\nTorque-Driven Spin Hall Nano-Oscillators\nUsing PtBi Alloys with Engineered Crystallinity"],"prefix":"10.1021","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9032-1841","authenticated-orcid":true,"given":"Utkarsh","family":"Shashank","sequence":"first","affiliation":[{"name":"University of Gothenburg , , ,","place":["Gothenburg, Sweden, 412 96"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4105-3681","authenticated-orcid":true,"given":"Akash","family":"Kumar","sequence":"additional","affiliation":[{"name":"University of Gothenburg , , ,","place":["Gothenburg, Sweden, 412 96"]},{"name":"Tohoku University , , 2-1-1 Katahira , Aoba-Ku, ,","place":["Sendai, Japan, 980-8577"]},{"name":"Tohoku University , , 2-1-1 Katahira , Aoba-Ku, ,","place":["Sendai, Japan, 980-8577"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tahereh Sadat","family":"Parvini","sequence":"additional","affiliation":[{"name":"Universita\u0308t Greifswald , , ,","place":["Greifswald, Germany, 17489"]},{"name":"Bayerische Akademie der Wissenschaften , , ,","place":["Garching, Germany, 85748"]},{"name":"Munich Center for Quantum Science and Technology (MCQST) , Schellingstr. 4 , ,","place":["Munich, Germany, 80799"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8577-5002","authenticated-orcid":true,"given":"Hauke","family":"Heyen","sequence":"additional","affiliation":[{"name":"Universita\u0308t Greifswald , , ,","place":["Greifswald, Germany, 17489"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4564-7217","authenticated-orcid":true,"given":"Lunjie","family":"Zeng","sequence":"additional","affiliation":[{"name":"Chalmers University of Technology , , ,","place":["Gothenburg, Sweden, 412 96"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1772-6778","authenticated-orcid":true,"given":"Andrew B.","family":"Yankovich","sequence":"additional","affiliation":[{"name":"Chalmers University of Technology , , ,","place":["Gothenburg, Sweden, 412 96"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8915-502X","authenticated-orcid":true,"given":"Jong-Guk","family":"Choi","sequence":"additional","affiliation":[{"name":"University of Gothenburg , , ,","place":["Gothenburg, Sweden, 412 96"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mona","family":"Rajabali","sequence":"additional","affiliation":[{"name":"NanOsc AB , ,","place":["Kista, Sweden, 164 40"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3791-9569","authenticated-orcid":true,"given":"Eva","family":"Olsson","sequence":"additional","affiliation":[{"name":"Chalmers University of Technology , , ,","place":["Gothenburg, Sweden, 412 96"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Markus","family":"Mu\u0308nzenberg","sequence":"additional","affiliation":[{"name":"Universita\u0308t Greifswald , , ,","place":["Greifswald, Germany, 17489"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3513-6608","authenticated-orcid":true,"given":"Johan","family":"\u00c5kerman","sequence":"additional","affiliation":[{"name":"University of Gothenburg , , ,","place":["Gothenburg, Sweden, 412 96"]},{"name":"Tohoku University , , 2-1-1 Katahira , Aoba-Ku, ,","place":["Sendai, Japan, 980-8577"]},{"name":"Tohoku University , , 2-1-1 Katahira , Aoba-Ku, ,","place":["Sendai, Japan, 980-8577"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,7,13]]},"reference":[{"key":"2026072908062460300_cit1","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1109\/TMAG.2021.3078583","article-title":"Roadmap of\nspin\u2013orbit torques","volume":"57","author":"Shao","year":"2021","journal-title":"IEEE Trans. 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Mater"},{"key":"2026072908062460300_cit41","doi-asserted-by":"publisher","first-page":"024034","DOI":"10.1103\/PhysRevApplied.8.024034","article-title":"Extrinsic spin Hall\neffect in Cu1\u2013xPtx","volume":"8","author":"Ramaswamy","year":"2017","journal-title":"Phys. Rev. Appl"},{"key":"2026072908062460300_cit42","doi-asserted-by":"publisher","first-page":"1805822","DOI":"10.1002\/adfm.201805822","article-title":"Strong damping-like\nspin\u2013orbit torque and tunable\nDzyaloshinskii\u2013Moriya interaction generated by low-resistivity\nPd1\u2013xPtx alloys","volume":"29","author":"Zhu","year":"2019","journal-title":"Adv. Funct. Mater"},{"key":"2026072908062460300_cit43","doi-asserted-by":"publisher","first-page":"1600112","DOI":"10.1002\/aelm.201600112","article-title":"Spin\nOrbit Coupling Controlled Spin Pumping and Spin\nHall Magnetoresistance Effects","volume":"2","author":"Ma","year":"2016","journal-title":"Adv. Electron.\nMater"},{"key":"2026072908062460300_cit44","doi-asserted-by":"publisher","first-page":"1700632","DOI":"10.1002\/aelm.201700632","article-title":"Giant inverse\nspin Hall effect in\nBi doped PtBi alloy","volume":"4","author":"Hong","year":"2018","journal-title":"Adv. Electron. Mater"},{"key":"2026072908062460300_cit45","doi-asserted-by":"publisher","first-page":"2100528","DOI":"10.1002\/aelm.202100528","article-title":"Tuning the\nHigh-Efficiency Field-Free Current-Induced Deterministic Switching\nvia Ultrathin PtMo Layer with Mo Content","volume":"7","author":"Bekele","year":"2021","journal-title":"Adv.\nElectron. Mater"},{"key":"2026072908062460300_cit46","doi-asserted-by":"publisher","first-page":"2000793","DOI":"10.1002\/aelm.202000793","article-title":"High-Efficiency Spin\u2013Orbit\nTorque Switching Using a Single Heavy-Metal Alloy with Opposite Spin\nHall Angles","volume":"7","author":"Bekele","year":"2021","journal-title":"Adv. Electron. Mater"},{"key":"2026072908062460300_cit47","doi-asserted-by":"publisher","first-page":"031001","DOI":"10.1103\/PhysRevApplied.10.031001","article-title":"Highly efficient spin-current generation\nby the spin Hall effect in Au1\u2013xPtx","volume":"10","author":"Zhu","year":"2018","journal-title":"Phys. Rev.\nAppl"},{"key":"2026072908062460300_cit48","doi-asserted-by":"publisher","first-page":"167204","DOI":"10.1103\/PhysRevLett.117.167204","article-title":"Tuning spin Hall angles\nby alloying","volume":"117","author":"Obstbaum","year":"2016","journal-title":"Phys. Rev. Lett"},{"key":"2026072908062460300_cit49","doi-asserted-by":"publisher","first-page":"024017","DOI":"10.1103\/PhysRevApplied.18.024017","article-title":"Energy-Efficient W100\u2013xTax\/Co-Fe-B\/MgO Spin\nHall Nano-Oscillators","volume":"18","author":"Behera","year":"2022","journal-title":"Phys. Rev. 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