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Orbital currents have a wider material range and longer transmission distance than spin currents. However, the efficient utilization of orbital currents remains challenging. In this paper, the study reports a giant effective orbital Hall angle in a Ti\/Pt metallic heterostructure for efficient magnetization switching. The effective orbital Hall angle of Ti\/Pt\/Permalloy (Ni<jats:sub>81<\/jats:sub>Fe<jats:sub>19<\/jats:sub>) reaches 2.4 \u00b1 0.5, a 14\u2010fold increase relative to that of Ti\/Ni. By constructing an interface orbital current transmission model, the study found that the effective orbital Hall angle is closely related to the interface spin\u2013orbit coupling. In addition, research obtained a critical magnetization switching current density of Ti\/Pt as low as 5.7 \u00d7 10<jats:sup>5<\/jats:sup> A\/cm<jats:sup>2<\/jats:sup>, which is comparable to that of topological insulators. Based on this metallic heterostructure, the study demonstrates high\u2010efficiency and low\u2010dissipation Boolean logic operation. These metallic heterostructures, which combine a large effective orbital Hall angle and ease of integration with semiconductors, have significant implications for large\u2010scale orbitronic device applications.<\/jats:p>","DOI":"10.1002\/smll.202408721","type":"journal-article","created":{"date-parts":[[2025,3,12]],"date-time":"2025-03-12T01:04:21Z","timestamp":1741741461000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Observation of Giant Effective Orbital Hall Angle in Ti\/Pt Metallic Heterostructure"],"prefix":"10.1002","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-8779-9372","authenticated-orcid":false,"given":"Xinkai","family":"Xu","sequence":"first","affiliation":[{"name":"School of Electronic Science and Engineering University of Electronic Science and Technology of China  Chengdu 610054 P. R. 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