Quantifying Spin-Orbit Torques in Antiferromagnet/Heavy Metal Heterostructures

Abstract

The effect of spin currents on the magnetic order of insulating antiferromagnets (AFMs) is of fundamental interest and can enable new applications. Toward this goal, characterizing the spin-orbit torques (SOT) associated with AFM/heavy metal (HM) interfaces is important. Here we report the full angular dependence of the harmonic Hall voltages in a predominantly easy-plane AFM, epitaxial c-axis oriented $\alpha$-Fe${}_2$O${}_3$ films, with an interface to Pt. By modeling the harmonic Hall signals together with the $\alpha$-Fe${}_2$O${}_3$ magnetic parameters, we determine the amplitudes of field-like and damping-like SOT. Out-of-plane field scans are shown to be essential to determining the damping-like component of the torques. In contrast to ferromagnetic/heavy metal heterostructures, our results demonstrate that the field-like torques are significantly larger than the damping-like torques, which we correlate with the presence of a large imaginary component of the interface spin-mixing conductance. Our work demonstrates a direct way of characterizing SOT in AFM/HM heterostructures.

References in corpus (30)

• Spin Hall effect
• Antiferromagnetic spintronics
• Antiferromagnetic spintronics
• Spin Caloritronics
• Electrical switching of an antiferromagnet
• Spin Hall Magnetoresistance Induced by a Non-Equilibrium Proximity Effect
• Spin pumping and magnetization dynamics in metallic multilayers
• Theory of spin Hall magnetoresistance
• Quantitative characterization of the spin orbit torque using harmonic Hall voltage measurements
• Roadmap of spin-orbit torques
• Interplay of spin-orbit torque and thermoelectric effects in ferromagnet/normal metal bilayers
• Intrinsic spin Hall effect in platinum metal
• Writing and Reading antiferromagnetic Mn${}_2$Au: Néel spin-orbit torques and large anisotropic magnetoresistance
• Spin pumping and spin-transfer torques in antiferromagnets
• Antidamping torque-induced switching in biaxial antiferromagnetic insulators
• Spin transfer and current-induced switching in antiferromagnets
• Terahertz Antiferromagnetic Spin Hall Nano-Oscillator
• Spin Torques in Ferromagnetic/Normal Metal Structures
• Spin Hall magnetoresistance in antiferromagnet/heavy-metal heterostructures
• Negative spin Hall magnetoresistance of Pt on the bulk easy-plane antiferromagnet NiO
• Electrical Switching of Tristate Antiferromagnetic Néel Order in $\alpha$-Fe${}_2$O${}_3$ Epitaxial Films
• Maximizing Spin-Orbit Torque Generated by the Spin Hall Effect of Pt
• Full angular dependence of the spin Hall and ordinary magnetoresistance in epitaxial antiferromagnetic NiO(001)/Pt thin films
• Quantitative Study on Current-Induced Effect in an Antiferromagnet Insulator/Pt Bilayer Film
• Spin Seebeck imaging of spin-torque switching in antiferromagnetic Pt/NiO heterostructures
• Anisotropic Magnetoresistance and Nontrivial Spin Hall Magnetoresistance in Pt/$\alpha$-Fe${}_2$O${}_3$ Bilayers
• Identification of Néel vector orientation in antiferromagnetic domains switched by currents in NiO/Pt thin films
• Direct Imaging of Electrical Switching of Antiferromagnetic Néel Order in $\alpha$-Fe${}_2$O${}_3$ Epitaxial Films
• Precessional spin-torque dynamics in biaxial antiferromagnets
• Theory of Harmonic Hall Responses of Spin-Torque Driven Antiferromagnets

Cited by in corpus (11)

• Intrinsic Nonlinear Hall Detection of the Néel Vector for Two-Dimensional Antiferromagnetic Spintronics
• Third Harmonic Characterization of Antiferromagnetic Heterostructures
• Thermal effects in spintronic materials and devices: an experimentalist's guide
• Absence of cross-sublattice spin pumping and spin-transfer torques in collinear antiferromagnets
• Estimation of spin-orbit torques in the presence of current-induced magnon creation and annihilation
• Theory of Harmonic Hall Responses of Spin-Torque Driven Antiferromagnets
• Impact of inherent energy barrier on spin-orbit torques in magnetic-metal/semimetal heterojunctions
• Large spin-orbit torque in a-plane $\alpha$-Fe${}_2$O${}_3$/Pt bilayers
• Coherent Spin Pumping Originated from Sub-Terahertz Néel Vector Dynamics in Easy Plane α-Fe2O3/Pt
• Characterizing Spin-Orbit Torques by Tensorial Spin Hall Magnetoresistance
• Magnetic precession induced spin accumulation in collinear antiferromagnets