Abstract
Coherent spin waves in exchange biased bilayers have been excited by ultrafast photomodulation of the exchange bias anisotropy. Photoinduced precession in CoFe∕IrMn samples with different IrMn thicknesses, thus, different exchange bias fields, has been studied in real time by time-resolved Kerr effect magnetometry. The extracted effective damping parameter is proportional to the square of the exchange bias field. Two-magnon scattering of the coherent precession of the ferromagnetic layer at local interfacial fluctuations of the exchange bias field can account for the observed increase. Hence, there is a time-domain evidence of two-magnon damping involved in the relaxation of photoexcited spins.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
