Abstract
Electrical spin-orbit torque (SOT) in magnetic insulators (MI) has been intensively studied due to its advantages in spin-orbitronic devices with ultralow energy consumption. However, the magnon torque in the MIs, which has the potential to further lower the energy consumption, still remains elusive. In this work, we demonstrate the efficient magnon torque transferred into an MI through an antiferromagnetic insulator. By fabricating a Pt/NiO/TmFeO heterostructure with different NiO thicknesses, we have systematically investigated the evolution of the transferred magnon torque. We show that the magnon torque efficiency transferred through the NiO into the MI can retain a high value (∼50%), which is comparable to the previous report for the magnon torque transferred into the metallic magnet. Our study manifests the feasibility of realizing the pure magnon-based spin-orbitronic devices with ultralow energy consumption and high efficiency.
Highlights
Discovering novel phenomena and functionalities originating from the spin-orbit coupling (SOC) is an emerging direction in spin-orbitronics [1,2,3,4]
In the spin-orbitronic devices, a pure spin current is generated from a charge current through the SOC, defined as electrical spin current, which can be transferred into a magnet, and works as electrical spin-orbit torque (SOT) to effectively manipulate its magnetization [5,6,7]
We show that the magnon torque efficiency transferred through the NiO into the magnetic insulators (MI) can retain a high value, which is comparable to the previous report for the magnon torque transferred into the metallic magnet
Summary
Discovering novel phenomena and functionalities originating from the spin-orbit coupling (SOC) is an emerging direction in spin-orbitronics [1,2,3,4]. In the spin-orbitronic devices, a pure spin current is generated from a charge current through the SOC, defined as electrical spin current, which can be transferred into a magnet, and works as electrical spin-orbit torque (SOT) to effectively manipulate its magnetization (see Figure 1a) [5,6,7]. The electrical SOT has been intensively studied due to its essential role in the spinorbitronic technology [8,9,10]. Another class of the spin current, defined as magnon current, has emerged and attracted much attention [11,12,13,14].
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