Determination of spin Hall angle in heavy metal/CoFeB-based heterostructures with interfacial spin-orbit fields

Abstract

Magnetization dynamics in W/CoFeB, CoFeB/Pt and W/CoFeB/Pt multilayers was investigated using spin-orbit-torque ferromagnetic resonance (SOT-FMR) technique. An analytical model based on magnetization dynamics due to SOT was used to fit heavy metal (HM) thickness dependence of symmetric and antisymmetric components of the SOT-FMR signal. The analysis resulted in a determination of the properties of HM layers, such as spin Hall angle and spin diffusion length. The spin Hall angle of -0.36 and 0.09 has been found in the W/CoFeB and CoFeB/Pt bilayers, respectively, which add up in the case of W/CoFeB/Pt trilayer. More importantly, we have determined effective interfacial spin-orbit fields at both W/CoFeB and CoFeB/Pt interfaces, which are shown to cancel Oersted field for particular thicknesses of the heavy metal layers, leading to pure spin-current-induced dynamics and indicating the possibility for a more efficient magnetization switching.

8 pages, 4 figures, submitted to Physical Review Applied

References in corpus (33)

• Spin torque switching with the giant spin Hall effect of tantalum
• Spin Hall effect
• Universal Intrinsic Spin-Hall Effect
• New Perspectives for Rashba Spin-Orbit Coupling
• Spin Torque Ferromagnetic Resonance Induced by the Spin Hall Effect
• Spin transfer torque devices utilizing the giant spin Hall effect of tungsten
• Nonlocal magnetization dynamics in ferromagnetic heterostructures
• 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
• Role of transparency of platinum-ferromagnet interface in determining intrinsic magnitude of spin Hall effect
• Comparative Measurements of Inverse Spin Hall and Magnetoresistance in YIG|Pt and YIG|Ta
• Quantitative study of the spin Hall magnetoresistance in ferromagnetic insulator/normal metal hybrids
• Spin torque study of the spin Hall conductivity and spin diffusion length in platinum thin films with varying resistivity
• Ultra-low magnetic damping of a metallic ferromagnet
• Magnetic oscillations driven by the spin Hall effect in 3-terminal magnetic tunnel junction devices
• Spin Hall magnetoresistance in metallic bilayers
• Tuning the spin Hall effect of Pt from the moderately dirty to the superclean regime
• Temperature dependence of spin diffusion length and spin Hall angle in Au and Pt
• Electrical Detection of Magnetization Dynamics via Spin Rectification Effects
• Anomalous temperature dependence of current induced torques in CoFeB|MgO heterostructures with Ta based underlayers
• Experimental Demonstration of the Co-existence of the Spin Hall and Rashba Effects in beta-Tantalum/Ferromagnet Bilayers
• Magnetoresistance of heavy and light metal/ferromagnet bilayers
• Microscopic theory of spin-orbit torques and skyrmion dynamics
• Spin-orbit torques from interfacial spin-orbit coupling for various interfaces
• Lack of correlation between the spin mixing conductance and the ISHE-generated voltages in CoFeB/Pt,Ta bilayers
• Spin-orbit torque opposing the Oersted torque in ultrathin Co/Pt bilayers
• Anomalous spin Hall magnetoresistance in Pt/Co bilayers
• Ballistic spin transport in the presence of interfaces with strong spin-orbit coupling
• Temperature dependence of spin-orbit torques in W/CoFeB bilayers
• Temperature dependence of the spin Hall angle and switching current in the nc-W(O)/CoFeB/MgO system with perpendicular magnetic anisotropy
• Current-induced spin polarization of a magnetized two-dimensional electron gas with Rashba spin-orbit interaction
• Rashba torque beyond the Boltzmann regime

Cited by in corpus (7)

• Determination of the spin Hall angle, spin mixing conductance and spin diffusion length in Ir/CoFeB for spin-orbitronic devices
• Field-free spin-orbit torque switching in Co/Pt/Co multilayer with mixed magnetic anisotropies
• Current-induced magnetization switching of exchange-biased NiO heterostructures characterized by spin-orbit torque
• Current-Induced magnetization switching by the high spin Hall conductivity $\alpha$-W
• Magnetic Proximity induced efficient charge-to-spin conversion in large area PtSe${}_2$/Ni${}_{80}$Fe${}_{20}$ heterostructures
• Reconfigurable neural spiking in bias field-free spin Hall nano oscillator
• Numerical Model Of Harmonic Hall Voltage Detection For Spintronic Devices