English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We have studied ultrafast photoinduced demagnetization in GaMnAs viatwo-color time-resolved magneto-optical Kerr spectroscopy. Below-bandgapmidinfrared pump pulses strongly excite the valence band, while near-infraredprobe pulses reveal sub-picosecond demagnetization that is followed by anultrafast ($\sim$1 ps) partial recovery of the Kerr signal. Through comparisonwith InMnAs, we attribute the signal recovery to an ultrafast energy relaxationof holes. We propose that the dynamical polarization of holes through $p$-$d$scattering is the source of the observed probe signal. These results supportthe physical picture of femtosecond demagnetization proposed earlier forInMnAs, identifying the critical roles of both energy and spin relaxation ofhot holes.

Femtosecond Demagnetization and Hot Hole Relaxation in Ferromagnetic GaMnAs