Detection of long-range orbital-Hall torques

Abstract

We report and quantify a large orbital-Hall torque generated by Nb and Ru, which we identify from a strong dependence of torques on the ferromagnets. This is manifested as a sign reversal and strong enhancement in the damping-like torques measured in Nb (or Ru)/Ni bilayers as compared to Nb (or Ru)/FeCoB bilayers. The long-range nature of orbital transport in the ferromagnet is revealed by the thickness dependences of Ni in Nb (or Ru)/Ni bilayers which are markedly different from the regular spin absorption in the ferromagnet that takes place within a few angstroms and thus it uniquely distinguishes the orbital Hall torque from the spin Hall torque.

References in corpus (10)

• Spin Transfer Torques
• Theory of spin Hall magnetoresistance
• Study of Intrinsic Spin Hall Effect and Orbital Hall Effect in 4d- and 5d- Transition Metals
• Orbitronics: Orbital Currents in Solids
• Giant orbital Hall effect and orbital-to-spin conversion in 3d, 5d, and 4f metallic heterostructures
• Maximally Localized Wannier Functions within the FLAPW formalism
• Theory of Current-Induced Angular Momentum Transfer Dynamics in Spin-Orbit Coupled Systems
• Orbital Rashba effect in surface oxidized Cu film
• Transverse and Longitudinal Spin-Torque Ferromagnetic Resonance for Improved Measurements of Spin-Orbit Torques
• Origins of transverse voltages generated by applied thermal gradients and applied electric fields in ferrimagnetic-insulator/heavy-metal bilayers

Cited by in corpus (23)

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• Exploring orbital-charge conversion mediated by interfaces with copper through spin-orbital pumping
• Orbitronics in Two-dimensional Materials
• Orbital Hall effect in mesoscopic devices
• Symmetry constraints on the orbital transport in solids
• Spin and orbital Hall currents detected via current induced magneto-optical Kerr effect in V and Pt
• Orbital Hall Responses in Disordered Topological Materials
• Ultrathin films of black phosphorus as suitable platforms for unambiguous observation of the orbital Hall effect
• Controlling the orbital Hall effect in gapped bilayer graphene in the terahertz regime
• Evidence of Ultrashort Orbital Transport in Heavy Metals Revealed by Terahertz Emission Spectroscopy
• Intrinsic torque on the orbital angular momentum in an electric field
• Non-reciprocity in magnon mediated charge-spin-orbital current interconversion
• Light-induced Orbital and Spin Magnetism in $3d$, $4d$, and $5d$ Transition Metals
• Orbital currents in lattice multiorbital systems: Continuity equation, torques, and RKKY interaction
• Violation of local reciprocity in charge-orbital interconversion
• Orbital splitter effect and spatial resolution of current-induced orbital accumulation
• Evidence of orbital Hall current induced correlation in second harmonic response of longitudinal and transverse voltage in light metal-ferromagnet bilayers
• Theoretical study of orbital torque: Dependence on ferromagnet species and nonmagnetic layer thickness
• Giant orbital magnetoresistance in the antiferromagnet CoO driven by dynamic orbital angular momentum interaction
• Inductive detection of inverse spin-orbit torques in magnetic heterostructures
• Orbital Hall effect in spin-3/2 hole-doped semiconductors and its implications for orbitronics