Orbital magnetoresistance in the antiferromagnet CoO driven by dynamic orbital angular momentum
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.
Authors
- G. Jakob (ORCID: https://orcid.org/0000-0001-9466-0840)
- Sachin Krishnia (ORCID: https://orcid.org/0000-0002-2710-8244)
- Takashi Kikkawa (ORCID: https://orcid.org/0000-0002-7789-604X)
- Marjana Ležaić (ORCID: https://orcid.org/0000-0002-7318-9444)
- Jairo Sinova (ORCID: https://orcid.org/0000-0002-9490-2333)
- Thibaud Denneulin (ORCID: https://orcid.org/0000-0001-7350-7943)
- Olena Gomonay (ORCID: https://orcid.org/0000-0002-9413-0337)
- Eiji Saitoh (ORCID: https://orcid.org/0000-0003-2675-0718)
- Dongwook Go (ORCID: https://orcid.org/0000-0001-5740-3829)
- Mathias Kläui (ORCID: https://orcid.org/0000-0002-4848-2569)
- Timo Kuschel (ORCID: https://orcid.org/0000-0002-9371-8876)
- Mahmoud Zeer (ORCID: https://orcid.org/0000-0002-6142-0493)
- Hiroki Arisawa (ORCID: https://orcid.org/0000-0001-7872-2861)
- András Kovács (ORCID: https://orcid.org/0000-0001-8485-991X)
- J. Kohler
- Leonid V. Pourovskii (ORCID: https://orcid.org/0000-0003-4003-3539)
- Rafal E. Dunin–Borkowski (ORCID: https://orcid.org/0000-0001-8082-0647)
- Yuriy Mokrousov (ORCID: https://orcid.org/0000-0003-1072-2421)
- Renyou Xu (ORCID: https://orcid.org/0009-0007-1046-078X)
- Florian Kronast (ORCID: https://orcid.org/0000-0001-6048-480X)
- Mehak Loyal (ORCID: https://orcid.org/0009-0000-3384-9922)
- Edgar Galindez‐Ruales (ORCID: https://orcid.org/0000-0002-3565-1474)
- Christin Schmitt (ORCID: https://orcid.org/0000-0002-5340-2826)
- Duc Tran
- Luca Micus
Institutions
- Japan Atomic Energy Agency (JP)
- Centre National de la Recherche Scientifique (FR)
- École Polytechnique (FR)
- Forschungszentrum Jülich (DE)
- Collège de France (FR)
- Johannes Gutenberg University Mainz (DE)
- Korea University (KR)
- Bielefeld University (DE)
- Tohoku University (JP)
- Norwegian University of Science and Technology (NO)
- Université Paris Sciences et Lettres (FR)
- Helmholtz-Zentrum Berlin für Materialien und Energie (DE)
- Ernst Ruska Centre (DE)
- Advanced Institute of Materials Science (JP)
- RIKEN Center for Emergent Matter Science (JP)
- Advanced Science Research Center (JP)
- The University of Tokyo (JP)
- Beihang University (CN)
- Texas A&M University (US)
Publication Details
- Journal
- Science
- Published
- 2026-07-02
- DOI
- https://doi.org/10.1126/science.adw1808
- Primary Topic
- Magnetic properties of thin films
- Type
- article
- Field-Weighted Citation Impact
- 0.00