Ultrafast optical observation of spin-pumping induced dynamic exchange coupling in ferromagnetic semiconductor/metal bilayer

Abstract

Spin angular momentum transfer in magnetic bilayers offers the possibility of ultrafast and low-loss operation for next-generation spintronic devices. We report the field- and temperature- dependent measurements on the magnetization precessions in Co${}_2$FeAl/(Ga,Mn)As by time-resolved magneto-optical Kerr effect (TRMOKE). Analysis of the effective Gilbert damping and phase shift indicates a clear signature of an enhanced dynamic exchange coupling between the two ferromagnetic (FM) layers due to the reinforced spin pumping at resonance. The temperature dependence of the dynamic exchange-coupling reveals a primary contribution from the ferromagnetism in (Ga,Mn)As.

arXiv commentarXiv admin note: text overlap with arXiv:2203.00293

References in corpus (6)

• Enhanced Gilbert Damping in Thin Ferromagnetic Films
• Dynamic exchange coupling in magnetic bilayers
• Electrical detection of spin pumping due to the precessing magnetization of a single ferromagnet
• Direct detection of pure spin-current by x-ray pump-probe measurements
• Optically driven spin pumping mediating collective magnetization dynamics in a spin valve structure
• Ultrafast enhancement of interfacial exchange coupling in ferromagnetic bilayer