Enhancing spin-orbit torque by strong interfacial scattering from ultra-thin insertion layers

Abstract

Increasing dampinglike spin-orbit torque (SOT) is both of fundamental importance for enabling new research into spintronics phenomena and also technologically urgent for advancing low-power spin-torque memory, logic, and oscillator devices. Here, we demonstrate that enhancing interfacial scattering by inserting ultra-thin layers within a spin Hall metals with intrinsic or side-jump mechanisms can significantly enhance the spin Hall ratio. The dampinglike SOT was enhanced by a factor of 2 via sub-monolayer Hf insertion, as evidenced by both harmonic response measurements and current-induced switching of in-plane magnetized magnetic memory devices with the record low critical switching current of ~73 uA (switching current density of 3.6x10^6 A/cm^2). This work demonstrates a very effective strategy for maximizing dampinglike SOT for low-power spin-torque devices.

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Cited by in corpus (25)

• Maximizing Spin-Orbit Torque Generated by the Spin Hall Effect of Pt
• Spin-orbit torque switching of magnetic tunnel junctions for memory application
• Fully Spin-transparent magnetic interfaces enabled by insertion of a paramagnetic NiO layer
• Switching of Perpendicular Magnetization by Spin-Orbit Torque
• Ultrafast spin-currents and charge conversion at 3d-5d interfaces probed by time-domain terahertz spectroscopy
• Maximizing the spin-orbit torque efficiency of Pt/Ti multilayers by optimization of the tradeoff between the intrinsic spin Hall conductivity and carrier lifetime
• Benchmarking of spin-orbit torque switching efficiency in Pt alloys
• Energy-efficient ultrafast SOT-MRAMs based on low-resistivity spin Hall metal Au0.25Pt0.75
• Toward 100% Spin-Orbit Torque Efficiency with High Spin-Orbital Hall Conductivity Pt-Cr Alloys
• Lack of simple correlation between switching current density and spin-orbit torque efficiency of perpendicularly magnetized spin-current generator/ferromagnet heterostructures
• Origin of Strong Two-Magnon Scattering in Heavy Metal/Ferromagnet/Oxide Heterostructures
• Strong variation of spin-orbit torques with relative spin relaxation rates in ferrimagnets
• Materials Requirements of High-Speed and Low-Power Spin-Orbit-Torque Magnetic Random-Access Memory
• Strong Spin-Orbit Torque Induced by the Intrinsic Spin Hall Effect in Cr1-xPtx
• Absence of significant spin current generation in Ti/FeCoB bilayers with strong interfacial spin-orbit coupling
• Interfacial Dzyaloshinskii-Moriya interaction and spin-orbit torque in Au1-xPtx/Co bilayers with varying interfacial spin-orbit coupling
• Unconventional anomalous Hall effect in 3d/5d multilayers mediated by the nonlocal spin-conductivity
• Boosting spin-orbit torque efficiency in spin-current generator/magnet/oxide superlattices
• Spin Hall magnetoresistance sensor using Au${}_x$Pt${}_{1-x}$ as the spin-orbit torque biasing layer
• Experimental evidence of spin-orbit torque from metallic interfaces
• Magnetic Switching in Monolayer 2D Diluted Magnetic Semiconductors via Spin-to- Spin Conversion
• Linear Enhancement of Spin-Orbit Torques and Absence of Bulk Rashba-Type Spin Splitting in Perpendicularly Magnetized [Pt/Co/W]n Superlattices
• Role of the chiral spin configuration in field-free spin-orbit torque-induced magnetization switching by a locally injected spin current
• Microscopic mechanisms of Strong Electron Scattering and Giant Anomalous Hall Effect in high-Curie-temperature Fe3GaTe2 van der Waals Films
• Large Spin-to-Charge Conversion in Ultrathin Gold-Silicon Multilayers