Magnon-Mediated Orbital Torque Switching through an Antiferromagnetic Insulator.
basic_science · Level V
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- Record sourced from PubMed, PMID 42216926.
- Also identified by DOI 10.1021/acs.nanolett.6c01352.
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Abstract
Magnon-mediated spin-orbit torque (SOT) has emerged as a promising mechanism for efficient magnetization control in spintronic devices. Here, we provide experimental evidence for magnon-mediated orbital torque─the orbital analogue of magnon-mediated SOT. We demonstrate that the current-induced torque in Ti/NiO/CoPt heterostructures is governed by the orbital Hall effect in the Ti layer and exhibits a strong dependence on the antiferromagnetic ordering of NiO, indicating the magnon-mediated transport of orbital angular momentum through the antiferromagnetic insulator. Notably, the magnon-mediated orbital torque enables efficient manipulation of perpendicular magnetization with reduced electrical currents. These results open a pathway toward highly efficient orbitronic devices driven by magnons.