Orbital magnetoresistance in the antiferromagnet CoO driven by dynamic orbital angular momentum
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.
Article Details
Journal Info
Science
American Association for the Advancement of Science
Authors (25)
Christin Schmitt
Institute of Physics, Johannes Gutenberg-University Mainz, Mainz, Germany.
Sachin Krishnia
Institute of Physics, Johannes Gutenberg-University Mainz, Mainz, Germany.
Mahmoud Zeer
Peter Grünberg Institut (PGI-1), Forschungszentrum Jülich and JARA, Jülich, Germany.
Edgar Galíndez-Ruales
Institute of Physics, Johannes Gutenberg-University Mainz, Mainz, Germany.
Mehak Loyal
Institute of Physics, Johannes Gutenberg-University Mainz, Mainz, Germany.
Jonas Köhler
Institute of Physics, Johannes Gutenberg-University Mainz, Mainz, Germany.
Luca Micus
Institute of Physics, Johannes Gutenberg-University Mainz, Mainz, Germany.
Takashi Kikkawa
Hiroki Arisawa
Department of Applied Physics, The University of Tokyo, Tokyo, Japan.
Thibaud Denneulin
Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich, Germany.
András Kovács
Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich, Germany.
Renyou Xu
Institute of Physics, Johannes Gutenberg-University Mainz, Mainz, Germany.
Duc Tran
Institute of Physics, Johannes Gutenberg-University Mainz, Mainz, Germany.
Florian Kronast
Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany.
Dongwook Go
Institute of Physics, Johannes Gutenberg-University Mainz, Mainz, Germany.
Leonid V. Pourovskii
CPHT, CNRS, École polytechnique, Institut Polytechnique de Paris, Palaiseau, France.
Rafal E. Dunin-Borkowski
Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich, Germany.
Timo Kuschel
Institute of Physics, Johannes Gutenberg-University Mainz, Mainz, Germany.
Marjana Ležaić
Peter Grünberg Institut (PGI-1), Forschungszentrum Jülich and JARA, Jülich, Germany.
Jairo Sinova
Eiji Saitoh
Gerhard Jakob
Institute of Physics, Johannes Gutenberg-University Mainz, Mainz, Germany.
Olena Gomonay
Institute of Physics, Johannes Gutenberg-University Mainz, Mainz, Germany.
Yuriy Mokrousov
Institute of Physics, Johannes Gutenberg-University Mainz, Mainz, Germany.
Mathias Kläui
Institute of Physics, Johannes Gutenberg-University Mainz, Mainz, Germany.