Orbital magnetoresistance in the antiferromagnet CoO driven by dynamic orbital angular momentum.
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| Title: | Orbital magnetoresistance in the antiferromagnet CoO driven by dynamic orbital angular momentum. |
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| Authors: | Schmitt, Christin (AUTHOR), Krishnia, Sachin (AUTHOR), Zeer, Mahmoud (AUTHOR), Galíndez-Ruales, Edgar (AUTHOR), Loyal, Mehak (AUTHOR), Köhler, Jonas (AUTHOR), Micus, Luca (AUTHOR), Kikkawa, Takashi (AUTHOR), Arisawa, Hiroki (AUTHOR), Denneulin, Thibaud (AUTHOR), Kovács, András (AUTHOR), Xu, Renyou (AUTHOR), Tran, Duc (AUTHOR), Kronast, Florian (AUTHOR), Go, Dongwook (AUTHOR), Pourovskii, Leonid V. (AUTHOR), Dunin-Borkowski, Rafal E. (AUTHOR), Kuschel, Timo (AUTHOR), Ležaić, Marjana (AUTHOR), Sinova, Jairo (AUTHOR) |
| Source: | Science. 7/2/2026, Vol. 393 Issue 6806, p76-79. 4p. |
| Subjects: | Enhanced magnetoresistance, Cobalt oxides, Spin-orbit interactions, Magnetoresistance, Magnetic materials, Antiferromagnetism |
| Abstract: | 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. Editor's summary: Spin currents can be used to control the magnetic state of ferromagnets, enabling applications such as spin-orbit torque magnetic random-access memory. However, the choice of materials for such applications is restricted by the requirement for strong spin-orbiting coupling, which is necessary to generate the spin currents. Instead of spin, Schmitt et al. coupled orbital currents directly to orbital magnetization in CoO/Cu* heterostructures. This approach proved effective in boosting the magnetoresistance signal measured by the researchers. —Jelena Stajic [ABSTRACT FROM AUTHOR] |
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| Database: | Psychology and Behavioral Sciences Collection |
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| Abstract: | 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. Editor's summary: Spin currents can be used to control the magnetic state of ferromagnets, enabling applications such as spin-orbit torque magnetic random-access memory. However, the choice of materials for such applications is restricted by the requirement for strong spin-orbiting coupling, which is necessary to generate the spin currents. Instead of spin, Schmitt et al. coupled orbital currents directly to orbital magnetization in CoO/Cu* heterostructures. This approach proved effective in boosting the magnetoresistance signal measured by the researchers. —Jelena Stajic [ABSTRACT FROM AUTHOR] |
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| ISSN: | 00368075 |
| DOI: | 10.1126/science.adw1808 |
