Micro-focused Brillouin light scattering study of the magnetization dynamics driven by Spin Hall effect in a transversely magnetized NiFe nanowire

Abstract

We employed micro-focused Brillouin light scattering to study the amplification of the thermal spin wave eigenmodes by means of a pure spin current, generated by the spin-Hall effect, in a transversely magnetized Pt(4nm)/NiFe(4nm)/SiO2(5nm) layered nanowire with lateral dimensions 500x2750 nm2. The frequency and the cross section of both the center (fundamental) and the edge spin wave modes have been measured as a function of the intensity of the injected dc electric current. The frequency of both modes exhibits a clear redshift while their cross section is greatly enhanced on increasing the intensity of the injected dc. A threshold-like behavior is observed for a value of the injected dc of 2.8 mA. Interestingly an additional mode, localized in the central part of the nanowire, appears at higher frequency on increasing the intensity of the injected dc above the threshold value. Micromagnetic simulations were used to quantitatively reproduce the experimental results and to investigate the complex non-linear dynamics induced by the spin-Hall effect, including the modification of the spatial profile of the spin wave modes and the appearance of the extra mode above the threshold.

arXiv comment13 pages, 4 figures in journal of applied physics 2015

References in corpus (10)

• Spin Torque Ferromagnetic Resonance Induced by the Spin Hall Effect
• The building blocks of magnonics
• Magnetic oscillations driven by the spin Hall effect in 3-terminal magnetic tunnel junction devices
• Spectral Characteristics of the Microwave Emission by the Spin Hall Nano-Oscillator
• Switching of a single ferromagnetic layer driven by spin Hall effect
• Spin-Hall Nano-oscillator: a micromagnetic study
• Time-Domain Studies of Very-Large-Angle Magnetization Dynamics Excited by Spin Transfer Torques
• Control of Propagating Spin Waves via Spin Transfer Torque in a Metallic Bilayer Waveguide
• Micromagnetic understanding of stochastic resonance driven by spin-transfertorque
• Non-stationary magnetization dynamics driven by spin transfer torque

Cited by in corpus (3)

• Magnetization oscillations and waves driven by pure spin currents
• Width dependent auto-oscillating properties of constriction based spin Hall nano-oscillators
• Temporal evolution of auto-oscillations in a YIG/Pt microdisc driven by pulsed spin Hall effect-induced spin-transfer torque