Highly fcc-textured Pt-Al alloy films grown on MgO(001) showing enhanced spin Hall efficiency

Abstract

We report on a systematic comparative study of the spin Hall efficiency between highly face-centered cubic (fcc)-textured Pt-Al alloy films grown on MgO(001) and poorly-crystallized Pt-Al alloy films grown on SiO${}_2$. Using CoFeB as the detector, we show that for Al compositions centering around $x=25$, mainly L1${}_2$ ordered Pt${}_{100-x}$Al${}_x$ alloy films grown on MgO exhibit outstanding charge-spin conversion efficiency. For Pt${}_{78}$Al${}_{22}$/CoFeB bilayer on MgO, we obtain damping-like spin Hall efficiency as high as ${\xi }_{\text{DL}}\sim +0.20$ and expect up to seven-fold reduction of power consumption compared to the polycrystalline bilayer of the same Al composition on SiO${}_2$. This work demonstrates that improving the crystallinity of fcc Pt-based alloys is a crucial step for achieving large spin Hall efficiency and low power consumption in this material class.

arXiv comment22 pages, 6 figures

References in corpus (34)

• Spin torque switching with the giant spin Hall effect of tantalum
• Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems
• Spin Transfer Torque Generated by the Topological Insulator Bi_2Se_3
• Blowing Magnetic Skyrmion Bubbles
• Symmetry and magnitude of spin-orbit torques in ferromagnetic heterostructures
• Spin Hall Magnetoresistance Induced by a Non-Equilibrium Proximity Effect
• Switching of perpendicular magnetization by spin-orbit torques in the absence of external magnetic fields
• Magnetization switching by spin-orbit torque in an antiferromagnet/ferromagnet bilayer system
• Layer thickness dependence of the current induced effective field vector in Ta|CoFeB|MgO
• Theory of spin Hall magnetoresistance
• Spin Pumping and Inverse Spin Hall Effect in Platinum: The Essential Role of Spin-Memory Loss at Metallic Interfaces
• Spin-Diffusion Lengths in Metals and Alloys, and Spin-Flipping at Metal/Metal Interfaces: an Experimentalist's Critical Review
• Magnetic skyrmion artificial synapse for neuromorphic computing
• Quantitative characterization of the spin orbit torque using harmonic Hall voltage measurements
• Role of transparency of platinum-ferromagnet interface in determining intrinsic magnitude of spin Hall effect
• Spin-orbit torques induced by interface-generated spin currents
• Current induced torques and interfacial spin-orbit coupling: Semiclassical Modeling
• Dependence of the Efficiency of Spin Hall Torque on the Transparency of Pt-Ferromagnetic Layer Interfaces
• Room-temperature perpendicular magnetization switching through giant spin-orbit torque from sputtered BixSe(1-x) topological insulator material
• A conductive topological insulator with colossal spin Hall effect for ultra-low power spin-orbit-torque switching
• Spin torque study of the spin Hall conductivity and spin diffusion length in platinum thin films with varying resistivity
• Interplay of spin-orbit torque and thermoelectric effects in ferromagnet/normal metal bilayers
• Intrinsic spin Hall effect in platinum metal
• Spin Hall magnetoresistance in metallic bilayers
• Tuning the spin Hall effect of Pt from the moderately dirty to the superclean regime
• Single-shot dynamics of spin-orbit torque and spin transfer torque switching in three-terminal magnetic tunnel junctions
• Highly efficient spin current generation by the spin Hall effect in Au${}_{1-x}$Pt${}_x$
• Spin-orbit torques in heavy metal/ferromagnet bilayers with varying strength of interfacial spin-orbit coupling
• Strong damping-like spin-orbit torque and tunable Dzyaloshinskii-Moriya interaction generated by low-resistivity Pd${}_{1-x}$Pt${}_x$ alloys
• Manufacturable 300mm platform solution for Field-Free Switching SOT-MRAM
• The spin Hall effect of Bi-Sb alloys driven by thermally excited Dirac-like electrons
• Maximizing the spin-orbit torque efficiency of Pt/Ti multilayers by optimization of the tradeoff between the intrinsic spin Hall conductivity and carrier lifetime
• Large Spin Anomalous Hall Effect in L1${}_0$-FePt: Symmetry and Magnetization Switching
• Benchmarking of spin-orbit torque switching efficiency in Pt alloys