Orbital magnetoresistance in the antiferromagnet CoO driven by dynamic orbital angular momentum

• 成果类型: Article
• 署名作者: Schmitt, Christin; Krishnia, Sachin; Zeer, Mahmoud; Galindez-Ruales, Edgar; Loyal, Mehak; Kohler, Jonas; Micus, Luca; Kikkawa, Takashi; Arisawa, Hiroki; Denneulin, Thibaud; Kovacs, Andras; Xu, Renyou; Tran, Duc; Kronast, Florian; Go, Dongwook; Pourovskii, Leonid V.; Dunin-Borkowski, Rafal E.; Kuschel, Timo; Lezaic, Marjana; Sinova, Jairo; Saitoh, Eiji; Jakob, Gerhard; Gomonay, Olena; Mokrousov, Yuriy; Klaui, Mathias
• 署名单位: Johannes Gutenberg University of Mainz; Helmholtz Association; Julich Research Centre; University of Tokyo; Japan Atomic Energy Agency; RIKEN; Helmholtz Association; Julich Research Centre; Beihang University; Helmholtz Association; Helmholtz-Zentrum fuer Materialien und Energie GmbH (HZB); Korea University; Institut Polytechnique de Paris; Centre National de la Recherche Scientifique (CNRS); Ecole Polytechnique; Universite PSL; College de France; University of Bielefeld; Texas A&M University System; Texas A&M University College Station; Tohoku University; University of Tokyo; Norwegian University of Science & Technology (NTNU)
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-8075; 1095-9203
• DOI: 10.1126/science.adw1808
• 发表日期: 2026-07-02
• 页码: 76-79
• 关键词: MAGNETIC-STRUCTURES

摘要

Recent predictions of orders of magnitude larger orbital current effects compared with spin currents have attracted considerable interest. However, orbital currents must first be converted into spin currents to interact with the static magnetization dominated by spin angular momentum in conventional magnets. By using a magnet dominated by orbital angular momentum (OAM), we demonstrate a 70-fold enhancement in orbital Hall magnetoresistance in cobalt II oxide/copper (CoO/Cu*), compared with spin Hall magnetoresistance in cobalt II oxide/platinum (CoO/Pt). This arises from interactions between dynamic OAM from surface-oxidized Cu* and static OAM in the antiferromagnetic insulator CoO. Our results show how by using OAM-dominated materials, we can harness the benefits of giant orbital currents that have not been possible using conventional spin-dominated magnets.