Quantitative characterization of spin-orbit torques in Pt/Co/Pt /Co/Ta/BTO heterostructure on the magnetization azimuthal angle dependence

Abstract

Substantial understanding of spin-orbit interactions in heavy-metal (HM)/ferromagnet (FM) heterostructures is crucial in developing spin-orbit torque (SOT) spintronics devices utilizing spin Hall and Rashba effects. Though the study of SOT effective fields dependence on the out-of-plane magnetization angle has been relatively extensive, the understanding of in-plane magnetization angle dependence remains unknown. Here, we analytically propose a method to compute the SOT effective fields as a function of the in-plane magnetization angle using harmonic Hall technique in perpendicular magnetic anisotropy (PMA) structures. Two different samples with PMA, Pt/Co/Pt/Co/Ta/BaTiO3 (BTO) test sample and Pt/Co/Pt/Co/Ta reference sample are studied using the derived formula. Our measurements reveal that only the dampinglike field of the test sample with BTO capping layer exhibits an in-plane magnetization angle dependence while no angular dependence is found in the reference sample. The presence of the BTO layer in the test sample, which gives rise to a Rashba effect at the interface, is ascribed as the source of the angular dependence of the the dampinglike field.

References in corpus (23)

• Spin torque switching with the giant spin Hall effect of tantalum
• Spin Hall effect
• Spin Torque Ferromagnetic Resonance Induced by the Spin Hall Effect
• Spin Transfer Torque Generated by the Topological Insulator Bi_2Se_3
• Blowing Magnetic Skyrmion Bubbles
• Roles of non-equilibrium conduction electrons on magnetization dynamics of ferromagnets
• Symmetry and magnitude of spin-orbit torques in ferromagnetic heterostructures
• 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
• Quantitative characterization of the spin orbit torque using harmonic Hall voltage measurements
• Mechanisms of spin-polarized current-driven magnetization switching
• Domain wall motion governed by the spin Hall effect
• Current induced torques and interfacial spin-orbit coupling: Semiclassical Modeling
• Magnetic oscillations driven by the spin Hall effect in 3-terminal magnetic tunnel junction devices
• Spin Transport at Interfaces with Spin-Orbit Coupling: Phenomenology
• Local charge and spin currents in magnetothermal landscapes
• Diffusive spin dynamics in ferromagnetic thin films with a Rashba interaction
• Nanowire Spin Torque Oscillator Driven by Spin Orbit Torques
• Quantum Kinetic Theory of Current-Induced Torques in Rashba Ferromagnets
• Interface enhanced spin-orbit torques and current-induced magnetization switching of Pd/Co/AlO${}_x$ layers
• Angular dependence of spin-orbit spin transfer torques
• Perpendicular magnetic anisotropy of two-dimensional Rashba ferromagnets