Coherent manipulation of magnetization precession in ferromagnetic semiconductor (Ga,Mn)As with successive optical pumping

TL;DR

This paper demonstrates dynamic control of magnetization precession in ferromagnetic (Ga,Mn)As using successive optical pulses, revealing large amplitude modulation and nonlinear effects through non-thermal processes.

Contribution

It introduces a method to control magnetization precession with light alone, highlighting the role of pulse timing and nonlinear dynamics in ferromagnetic semiconductors.

Findings

Precession amplitude can be significantly modulated by pulse interval.

Nonlinear effects influence the precession motion.

Magnetization control achieved through non-thermal optical processes.

Abstract

We report dynamic control of magnetization precession by light alone. A ferromagnetic (Ga,Mn)As epilayer was used for experiments. Amplitude of precession was modulated to a large extent by tuning the time interval between two successive optical pump pulses which induced torques on magnetization through a non-thermal process. Nonlinear effect in precession motion was also discussed.