Electron-magnon spin conversion and magnonic spin pumping in antiferromagnet/heavy metal heterostructure

Abstract

We study the exchange between electron and magnon spins at the interface of an antiferromagnet and a heavy metal at finite temperatures. The underlying physical mechanism is based on spin torque associated with the creation/annihilation of thermal magnons with right-hand and left-hand polarization. The creation/annihilation process depends strongly on the relative orientation between the polarization of the electron and the magnon spins. For a sufficiently strong spin transfer torque (STT), the conversion process becomes nonlinear, generating a nonzero net spin pumping current in the AFM that can detected in the neighboring metal layer. Applying an external magnetic field renders possible the manipulation of the STT driving thermal spin pumping. Our theoretical results are experimentally feasible and are of a direct relevance to antiferromagnet-based spintronic devices.

arXiv comment10 pages, 6 figures

References in corpus (32)

• Spintronics: Fundamentals and applications
• Spin Hall effect
• Antiferromagnetic spintronics
• Antiferromagnetic spintronics
• Magnetic switching by spin torque from the spin Hall effect
• Electrical switching of an antiferromagnet
• Direct electronic measurement of the spin Hall effect
• Nonlocal magnetization dynamics in ferromagnetic heterostructures
• Spin Seebeck insulator
• Symmetry and magnitude of spin-orbit torques in ferromagnetic heterostructures
• Theory of spin Hall magnetoresistance
• Theory of magnon-driven spin Seebeck effect
• Electrically controlled long-distance spin transport through an antiferromagnetic insulator
• Spin pumping and spin-transfer torques in antiferromagnets
• Antiferromagnonic Spin Transport from Y${}_3$Fe${}_5$O${}_{12}$ into NiO
• Antiferromagnetic spin Seebeck Effect
• Antidamping torque-induced switching in biaxial antiferromagnetic insulators
• Subterahertz spin pumping from an insulating antiferromagnet
• Terahertz Antiferromagnetic Spin Hall Nano-Oscillator
• Spin pumping by parametrically excited exchange magnons
• Enhancement of Thermally Injected Spin Current through an Antiferromagnetic Insulator
• Spin Oscillations in Antiferromagnetic NiO Triggered by Circularly Polarized Light
• Enhanced spin pumping efficiency in antiferromagnetic IrMn thin films around the magnetic phase transition
• Direct detection of magnon spin transport by the inverse spin Hall effect
• Anti-damping spin transfer torque through epitaxial Nickel oxide
• Coherent transfer of spin angular momentum by evanescent spin waves within antiferromagnetic NiO
• Spin Pumping and Inverse Spin Hall Voltages from Dynamical Antiferromagnets
• Enhanced Spin Conductance of a Thin-Film Insulating Antiferromagnet
• Coherent ac spin current transmission across an antiferromagnetic CoO insulator
• Spin-transfer Antiferromagnetic Resonance
• Conversion of electronic to magnonic spin current at heavy-metal magnetic-insulator interface
• Influence of spin-orbit and spin-Hall effects on the spin Seebeck current beyond linear response