Deep Learning for Spin-Orbit Torque Characterizations with a Projected Vector Field Magnet

Abstract

Spin-orbit torque characterizations on magnetic heterostructures with perpendicular anisotropy are demonstrated on a projected vector field magnet via hysteresis loop shift measurement and harmonic Hall measurement with planar Hall correction. Accurate magnetic field calibration of the vector magnet is realized with the help of deep learning models, which are able to capture the nonlinear behavior between the generated magnetic field and the currents applied to the magnet. The trained models can successfully predict the applied current combinations under the circumstances of magnetic field scans, angle scans, and hysteresis loop shift measurements. The validity of the models is further verified, complemented by the comparison of the spin-orbit torque characterization results obtained from the deep-learning-trained vector magnet system with those obtained from a conventional setup comprised of two separated electromagnets. The damping-like spin-orbit torque (DL-SOT) efficiencies (|${\xi }_{DL}$|) extracted from the vector magnet and the traditional measurement configuration are consistent, where |${\xi }_{DL}$| $\approx$ 0.22 for amorphous W and |${\xi }_{DL}$| $\approx$ 0.02 for $\alpha$-W. Our work provides an advanced method to meticulously control a vector magnet and to conveniently perform various spin-orbit torque characterizations.

References in corpus (24)

• Spin torque switching with the giant spin Hall effect of tantalum
• Current-driven dynamics of chiral ferromagnetic domain walls
• Spin Torque Ferromagnetic Resonance Induced by the Spin Hall Effect
• Spin transfer torque devices utilizing the giant spin Hall effect of tungsten
• Dynamics of Dzyaloshinskii domain walls in ultrathin magnetic films
• Spin Hall Magnetoresistance Induced by a Non-Equilibrium Proximity Effect
• Layer thickness dependence of the current induced effective field vector in Ta|CoFeB|MgO
• Quantitative characterization of the spin orbit torque using harmonic Hall voltage measurements
• Domain wall motion governed by the spin Hall effect
• Dependence of the Efficiency of Spin Hall Torque on the Transparency of Pt-Ferromagnetic Layer Interfaces
• Interplay of spin-orbit torque and thermoelectric effects in ferromagnet/normal metal bilayers
• Determination of the Spin-Hall-Effect-Induced and the Wedged-Structure-Induced Spin Torque Efficiencies in Heterostructures with Perpendicular Magnetic Anisotropy
• Matching domain wall configuration and spin-orbit torques for very efficient domain-wall motion
• Magnetic oscillations driven by the spin Hall effect in 3-terminal magnetic tunnel junction devices
• Spin Hall magnetoresistance in metallic bilayers
• Harnessing non-local orbital-to-spin conversion of interfacial orbital currents for efficient spin-orbit torques
• Enhancement of Perpendicular Magnetic Anisotropy and Transmission of Spin-Hall-Effect-Induced Spin Currents by a Hf Spacer Layer in W/Hf/CoFeB/MgO Layer
• Spectral Characteristics of the Microwave Emission by the Spin Hall Nano-Oscillator
• Correlation between the spin Hall angle and the structural phases of early 5d transition metals
• The current-induced spin-orbit torque and field-free switching from Mo-based magnetic heterostructures
• All-optical Detection of Spin Hall Angle in W/CoFeB/SiO2 Heterostructures by Varying Tungsten Layer Thickness
• A Comparative Study on Spin-Orbit Torque Efficiencies from W/ferromagnetic and W/ferrimagnetic Heterostructures
• Accurate analysis for harmonic Hall voltage measurement for spin-orbit torques
• Sagnac interferometry for high-sensitivity optical measurements of spin-orbit torque

Cited by in corpus (1)

• Field-Free Switching in Symmetry Breaking Multilayers: The Critical Role of Interlayer Chiral Exchange