The electronic band-structure controlled ultrafast demagnetization mechanism in Co2FexMn1-xSi Heusler alloy is underpinned by systematic variation of composition. We find the spin-flip scattering rate controlled by spin density of states at the Fermi level is responsible for nonmonotonic variation of ultrafast demagnetization time (τM) with x with a maximum at x=0.4. Furthermore, Gilbert damping constant exhibits an inverse relationship with τM due to the dominance of interband scattering mechanism. This demonstrates a connection between ultrafast demagnetization and magnetic damping based on Fermi-level position in this Heusler alloy system.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics