Investigating spin and orbital effects via spin-torque ferromagnetic resonance
arXiv:2603.23826 · doi:10.1063/5.0320961
Abstract
In this work, we experimentally investigate spin and orbital torque phenomena using the spin-torque ferromagnetic resonance (ST-FMR) technique in a series of bilayer systems composed of different normal metal (NM) materials. Permalloy (Py) and Ni were employed as ferromagnetic (FM) layers to probe the spin and orbital torque responses, respectively. For the SiO/FM/NM bilayers, we extracted the damping-like and field-like torque components, as well as the damping-like torque efficiency for each sample, and compared our results with previously reported numerical and experimental data in the literature. Additionally, we experimentally demonstrate the presence of an out-of-plane torque component, which we attribute to interfacial mechanisms and associate with a spin-orbital polarized current along the -direction. This interpretation is supported by the azimuthal angular dependence of the applied magnetic field. Our results provide compelling evidence of orbital torque associated with the orbital Hall effect (OHE) in several materials, thereby broadening the prospects for magnetization switching driven by orbital torque.
27 pages, 9 figures, 2 tables
References in corpus (28)
- Spin Hall effect
- Magnetic switching by spin torque from the spin Hall effect
- Spin Transfer Torques
- Spin Torque Ferromagnetic Resonance Induced by the Spin Hall Effect
- Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems
- Spin Transfer Torque Generated by the Topological Insulator Bi_2Se_3
- Control of spin-orbit torques through crystal symmetry in WTe2/ferromagnet bilayers
- Intrinsic Spin and Orbital Hall Effects from Orbital Texture
- Observation of the orbital Hall effect in a light metal Ti
- Giant Orbital Hall Effect in Transition Metals: Origin of Large Spin and Anomalous Hall Effects
- Harnessing non-local orbital-to-spin conversion of interfacial orbital currents for efficient spin-orbit torques
- Orbitronics: the Intrinsic Orbital Hall Effect in p-Doped Silicon
- Orbitronics: Orbital Currents in Solids
- Orbital Torque: Torque Generation by Orbital Current Injection
- Observation of long-range orbital transport and giant orbital torque
- Transverse and Longitudinal Spin-Torque Ferromagnetic Resonance for Improved Measurements of Spin-Orbit Torques
- Spin-orbit torque characterization in a nutshell
- Spin-transfer and spin-orbit torques in the Landau-Lifshitz-Gilbert equation
- Exploring orbital-charge conversion mediated by interfaces with copper through spin-orbital pumping
- Bulk and Interface Effects Based on Rashba-Like States in Ti and Ru Nanoscale-Thick Films: Implications for Orbital-Charge Conversion in Spintronic Devices
- Orbitronics in Two-dimensional Materials
- Anomalous Spin and Orbital Hall Phenomena in Antiferromagnetic Systems
- Negative orbital Hall effect in Germanium
- Resolving Discrepancies in Spin-Torque Ferromagnetic Resonance Measurements: Lineshape vs. Linewidth Analyses
- Anatomy of electrical signals and dc-voltage lineshape in spin torque ferromagnetic resonance
- Observation of gigantic spin conversion anisotropy in bismuth
- Visualization of out-of-plane spin generation in mirror symmetry broken Co
- Theoretical study of orbital torque: Dependence on ferromagnet species and nonmagnetic layer thickness