Absence of significant spin current generation in Ti/FeCoB bilayers with strong interfacial spin-orbit coupling

Abstract

After one decade of the intensive theoretical and experimental explorations, whether interfacial spin-orbit coupling (ISOC) at metallic magnetic interfaces can effectively generate a spin current has remained in dispute. Here, utilizing the Ti/FeCoB bilayers that are unique for the negligible bulk spin Hall effect and the strong tunable ISOC, we establish that there is no significant charge-to-spin conversion at magnetic interfaces via spin-orbit filtering effect or Rashba-Edelstein(-like) effect even when the ISOC is stronger than that of a typical Pt/ferromagnet interface and can promote strong perpendicular magnetic anisotropy. We also find a minimal orbital Hall effect in 3d Ti.

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Cited by in corpus (11)

• Observation of long-range orbital transport and giant orbital torque
• Maximizing Spin-Orbit Torque Generated by the Spin Hall Effect of Pt
• Switching of Perpendicular Magnetization by Spin-Orbit Torque
• Quantitative comparison of electrically induced spin and orbital polarizations in heavy-metal/3d-metal bilayers
• Interfacial and bulk spin Hall contributions to field-like spin-orbit torque generated by Iridium
• Strong Spin-Orbit Torque Induced by the Intrinsic Spin Hall Effect in Cr1-xPtx
• Boosting spin-orbit torque efficiency in spin-current generator/magnet/oxide superlattices
• Efficient generation of out-of-plane polarized spin current in polycrystalline heavy metal devices with broken electric symmetries
• Linear Enhancement of Spin-Orbit Torques and Absence of Bulk Rashba-Type Spin Splitting in Perpendicularly Magnetized [Pt/Co/W]n Superlattices
• Negligible current-induced torque from the bulk and interface of Al
• Large spin-charge interconversion induced by interfacial spin-orbit coupling in a highly conducting all-metallic system