Effects of spin-orbit torque on the ferromagnetic and exchange spin wave modes in ferrimagnetic CoGd alloy

Abstract

We use micro-focus Brillouin light scattering spectroscopy to study the effects of spin-orbit torque on thermal spin waves in almost angular-momentum compensated ferrimagnetic CoGd alloy films. The spin-orbit torque is produced by the electric current flowing in the Pt layer adjacent to CoGd. Both the ferromagnetic and the exchange modes are detected in our measurements. The intensity and the linewidth of the ferromagnetic mode are modified by the spin-orbit torque. In contrast, the properties of the exchange mode are unaffected by the spin-orbit torque. We also find that the frequencies and the linewidths of both modes are significantly modified by Joule heating, due to the strong temperature dependence of the magnetic properties of CoGd in the vicinity of angular momentum compensation point. Our results provide insight into the mechanisms that can enable the implementation of sub-THz magnetic nano-oscillators based on ferrimagnetic materials, as well as related effects in antiferromagnets.

References in corpus (15)

• Spin Hall effect
• Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems
• Magnetic oscillations driven by the spin Hall effect in 3-terminal magnetic tunnel junction devices
• Terahertz Antiferromagnetic Spin Hall Nano-Oscillator
• Generation of coherent spin-wave modes in Yttrium Iron Garnet microdiscs by spin-orbit torque
• Nanowire Spin Torque Oscillator Driven by Spin Orbit Torques
• Magnetization oscillations and waves driven by pure spin currents
• THz-Frequency Spin-Hall Auto-Oscillator Based on a Canted Antiferromagnet
• Spin-orbit-torque magnonics
• Bridging magnonics and spin-orbitronics
• CMOS compatible W/CoFeB/MgO spin Hall nano-oscillators with wide frequency tunability
• Micromagnetic modeling of Terahertz oscillations in an antiferromagnetic material driven by spin-Hall effect
• Sub-terahertz ferrimagnetic spin-transfer torque oscillator
• Domain wall-based spin-Hall nano-oscillators
• Temperature dependence of magnetic resonance in ferrimagnetic GdFeCo alloys

Cited by in corpus (4)

• Spatially Nonuniform Oscillations in Ferrimagnets Based on an Atomistic Model
• Inductive detection of inverse spin-orbit torques in magnetic heterostructures
• Energy-efficient spin Hall nano-oscillators using near-compensated CoGd ferrimagnets
• Probing Laser-Induced Spin-Current Generation in Synthetic Ferrimagnets Using Spin Waves