Ferrimagnet GdFeCo characterization for spin-orbitronics: large field-like and damping-like torques

Abstract

Spintronics is showing promising results in the search for new materials and effects to reduce energy consumption in information technology. Among these materials, ferrimagnets are of special interest, since they can produce large spin currents that trigger the magnetization dynamics of adjacent layers or even their own magnetization. Here, we present a study of the generation of spin current by GdFeCo in a GdFeCo/Cu/NiFe trilayer where the FeCo sublattice magnetization is dominant at room temperature. Magnetic properties such as the saturation magnetization are deduced from magnetometry measurements while damping constant is estimated from spin-torque ferromagnetic resonance (ST-FMR). We show that the overall damping-like (DL) and field-like (FL) effective fields as well as the associated spin Hall angles can be reliably obtained by performing the dependence of ST-FMR by an added dc current. The sum of the spin Hall angles for both the spin Hall effect (SHE) and the spin anomalous Hall effect (SAHE) symmetries are: ${\theta }_{DL}^{SAHE}+{\theta }_{DL}^{SHE}=-0.15\pm 0.05$ and ${\theta }_{FL}^{SAHE}+{\theta }_{FL}^{SHE}=0.026\pm 0.005$. From the symmetry of ST-FMR signals we find that ${\theta }_{DL}^{SHE}$ is positive and dominated by the negative ${\theta }_{DL}^{SAHE}$. The present study paves the way for tuning the different symmetries in spin conversion in highly efficient ferrimagnetic systems.

arXiv comment20 pages, 4 figures

References in corpus (23)

• Spin Torque Ferromagnetic Resonance Induced by the Spin Hall Effect
• Spin Pumping and Inverse Spin Hall Effect in Platinum: The Essential Role of Spin-Memory Loss at Metallic Interfaces
• Dependence of the Efficiency of Spin Hall Torque on the Transparency of Pt-Ferromagnetic Layer Interfaces
• Matching domain wall configuration and spin-orbit torques for very efficient domain-wall motion
• Spin-orbit driven ferromagnetic resonance: A nanoscale magnetic characterisation technique
• Field-free spin-orbit torque-induced switching of perpendicular magnetization in a ferrimagnetic layer with vertical composition gradient
• Comparison of spin-orbit torques and spin pumping across NiFe/Pt and NiFe/Cu/Pt interfaces
• Anomalous Spin-Orbit Torques in Magnetic Single-Layer Films
• Planar Hall torque
• Spin Injection and Detection via the Anomalous Spin Hall Effect in a Ferromagnetic Metal
• Low magnetic damping of ferrimagnetic GdFeCo alloys
• Current-induced spin torques on single GdFeCo magnetic layers
• Amorphous GdFeCo Films Exhibiting Large and Tunable Perpendicular Magnetic Anisotropy
• Single shot ultrafast all optical magnetization switching of ferromagnetic Co/Pt multilayers
• Interfacial spin-orbit torques
• Large Spin Anomalous Hall Effect in L1${}_0$-FePt: Symmetry and Magnetization Switching
• Determination of the spin Hall angle, spin mixing conductance and spin diffusion length in Ir/CoFeB for spin-orbitronic devices
• Tuning interfacial Dzyaloshinskii-Moriya interactions in thin amorphous ferrimagnetic alloys
• Spin-orbit coupling in single layer ferrimagnets: direct observation of spin-orbit torques and chiral spin textures
• Planar Hall driven torque in a FM/NM/FM system
• Charge-spin current conversion in high quality epitaxial Fe/Pt systems: isotropic spin Hall angle along different in-plane crystalline directions
• A Multiple Step-like Spectrum of Primordial Perturbation
• Self-induced spin-orbit torques in metallic ferromagnets

Cited by in corpus (4)

• On field-driven domain wall motion in compensated ferrimagnetic nanowires
• Self-induced spin pumping and inverse spin Hall effect in single FePt thin films
• RF field characterization and rectification effects in spin pumping and spin-torque FMR for spin-orbitronics
• Spin current symmetries generated by GdFeCo ferrimagnet across its magnetisation compensation temperature