Orbital Pumping in Ferrimagnetic Insulators

Abstract

We report the detection of pure orbital currents generated by both coherent and thermal magnons in the magnetic insulator Bi-doped yttrium iron garnet (BiYIG). The pumping of orbital and spin currents is jointly investigated in nano-devices made of naturally oxidized Cu, pure Cu, Pt, and Cr. The absence of charge conduction in BiYIG and the negligible spin-to-charge conversion of oxidized Cu allows us to disambiguate the orbital current contribution. Comparative measurements on YIG and BiYIG show that the origin of the orbital pumping in BiYIG/oxidized Cu is the dynamics of the orbital magnetization in the magnetic insulator. In Cr, the pumping signal is dominated by the negative spin Hall effect rather than the positive orbital Hall effect, indicating that orbital currents represent a minority of the total angular momentum current pumped from the magnetic insulator. Our results also evidence that improving the interfacial transparency significantly enhances pumping efficiencies not only for spin, but also for orbital currents.

References in corpus (46)

• Spin torque switching with the giant spin Hall effect of tantalum
• Electronic spin transport and spin precession in single graphene layers at room temperature
• Spin Transfer Torques
• Spin Caloritronics
• Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems
• Nonlocal magnetization dynamics in ferromagnetic heterostructures
• Spin Seebeck insulator
• Quantifying spin Hall angles from spin pumping: Experiments and Theory
• Study of Intrinsic Spin Hall Effect and Orbital Hall Effect in 4d- and 5d- Transition Metals
• Intrinsic Spin and Orbital Hall Effects from Orbital Texture
• Observation of the orbital Hall effect in a light metal Ti
• Giant Orbital Hall Effect in Transition Metals: Origin of Large Spin and Anomalous Hall Effects
• Spin pumping by parametrically excited exchange magnons
• Harnessing non-local orbital-to-spin conversion of interfacial orbital currents for efficient spin-orbit torques
• Gigantic intrinsic orbital Hall effects in weakly spin-orbit coupled metals
• Single-shot dynamics of spin-orbit torque and spin transfer torque switching in three-terminal magnetic tunnel junctions
• Orbitronics: the Intrinsic Orbital Hall Effect in p-Doped Silicon
• Orbital Torque: Torque Generation by Orbital Current Injection
• Electrical Detection of Magnetization Dynamics via Spin Rectification Effects
• Observation of long-range orbital transport and giant orbital torque
• Giant orbital Hall effect and orbital-to-spin conversion in 3d, 5d, and 4f metallic heterostructures
• Observation of the Orbital Rashba-Edelstein Magnetoresistance
• Magneto-Optical Detection of the Orbital Hall Effect in Chromium
• Magnetization oscillations and waves driven by pure spin currents
• Non-trivial charge-to-spin conversion in ferromagnetic metal/Cu/Al2O3 by orbital transport
• Optimization of the yttrium iron garnet/platinum interface for spin pumping-based applications
• Orbital Rashba effect in surface oxidized Cu film
• Resources of nonlinear cavity magnonics for quantum information
• Spin-orbit torque switching of magnetic tunnel junctions for memory application
• Measurement of spin pumping voltage separated from extrinsic microwave effects
• Intrinsic spin-orbit torque arising from Berry curvature in metallic-magnet/Cu-oxide interface
• Enhancement of Pure Spin Currents in Spin Pumping Y3Fe5O12/Cu/metal Trilayers through Spin Conductance Matching
• Orbital Hanle Magnetoresistance in a 3d Transition Metal
• Spin and spin current -- From fundamentals to recent progress
• Orbital Torque in Rare-Earth Transition-Metal Ferrimagnets
• Spin Pumping Driven by Bistable Exchange Spin Waves
• Impact of the interface quality of Pt/YIG(111) hybrids on their spin Hall magnetoresistance
• Nonlocal detection of interlayer three-magnon coupling
• A First Principle Study on Magneto-Optical Effects and Magnetism in Ferromagnetic Semiconductors Y${}_3$Fe${}_5$O${}_{12}$ and Bi${}_3$Fe${}_5$O${}_{12}$
• Exploring orbital-charge conversion mediated by interfaces with copper through spin-orbital pumping
• Orbital Pumping Incorporating Both Orbital Angular Momentum and Position
• Bulk and Interface Effects Based on Rashba-Like States in Ti and Ru Nanoscale-Thick Films: Implications for Orbital-Charge Conversion in Spintronic Devices
• Large Chiral Orbital Texture and Orbital Edelstein Effect in Co/Al Heterostructure
• Mitigation of Gilbert Damping in the CoFe/CuOx Orbital Torque System
• Interface transparency to orbital current
• Theory of spin and orbital charge conversion at the surface states of Bi_{1-x}Sb_x topological insulator

Cited by in corpus (4)

• Ultrathin bismuth-yttrium iron garnet films with tunable magnetic anisotropy
• Probing orbital currents through inverse orbital Hall and Rashba effects
• Coherent Microwave Driving of Domain Wall Depinning in a Ferrimagnetic Garnet
• Disambiguating electrical detection of magnetization dynamics in magnetic insulators