Ultrafast demagnetization mechanism in half-metallic Heusler alloy thin films controlled by the Fermi level

Santanu Pan, Takeshi Seki, Koki Takanashi, Anjan Barman

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
JournalPhysical Review B
Volume101
Issue number22
DOIs
Publication statusPublished - 2020 Jun 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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