Substrate-Controlled Ultrafast Spin Injection and Demagnetization

J. K. Dewhurst, S. Shallcross, E. K.U. Gross, S. Sharma

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28 Scopus citations


We investigate the laser-induced ultrafast injection of spin from a ferromagnetic (FM) material into a nonmagnetic (NM) one, for a diverse set of FM-NM interfaces. For all systems, we find the early time (t<20 fs) spin dynamics to be driven by spin currents, with majority spin transferred to the NM and minority spin to the FM. At later times, spin-orbit-induced spin flips further demagnetize the FM, but also deplete the NM of the substantial spin moment injected during the sub-20-fs spin dynamics. We identify the density of unoccupied states in the NM material to be the key physical property that underpins the physics of ultrafast demagnetization of FM layers and a complex interplay of this density of states with the spin-orbit (SO) coupling strength of the NM substrate to be responsible for spin-injection efficiency.

Original languageAmerican English
Article number044065
JournalPhysical Review Applied
Issue number4
StatePublished - 26 Oct 2018
Externally publishedYes

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© 2018 American Physical Society.


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