Ultrafast Enhancement of Ferromagnetism via Photoexcited Holes in GaMnAs
J. Wang, I. Cotoros, K. M. Dani, D. S. Chemla (Materials Sciences, Division, E.O. Lawrence Berkeley National Laboratory, Department of, Physics, University of California at Berkeley, Berkeley, California) X. Liu, and J. K. Furdyna (Department of Physics, University of Notre Dame
TL;DR
This paper demonstrates ultrafast photoinduced enhancement of ferromagnetism in GaMnAs, showing a transient increase in magnetization driven by photoexcited holes affecting Mn spins, with potential implications for ultrafast magnetic control.
Contribution
It reports the first observation of ultrafast ferromagnetic enhancement in GaMnAs due to photoexcited holes, revealing a transient increase in Tc and collective magnetic ordering dynamics.
Findings
Transient magnetization increase on a 100-ps timescale
Maximum enhancement observed below the Curie temperature
Correlation-induced peak in Tc around 20K
Abstract
We report on the observation of ultrafast photo-enhanced ferromagnetism in GaMnAs. It is manifested as a transient magnetization increase on a 100-ps time scale, after an initial sub-ps demagnetization. The dynamic magnetization enhancement exhibits a maximum below the Curie temperature Tc and dominates the demagnetization component when approaching Tc. We attribute the observed ultrafast collective ordering to the p-d exchange interaction between photoexcited holes and Mn spins, leading to a correlation-induced peak around 20K and a transient increase in Tc.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.