Magnetization precession induced by quasi-transverse picosecond strain pulses in (311) ferromagnetic (Ga,Mn)As

TL;DR

This study demonstrates that picosecond strain pulses can induce and control magnetization precession in ferromagnetic (Ga,Mn)As films, offering a pathway for ultrafast magnetic manipulation using strain engineering.

Contribution

It introduces a method to modulate magnetic anisotropy and induce magnetization precession using quasi-transverse strain pulses in (Ga,Mn)As, supported by theoretical analysis.

Findings

Magnetization precession at ~10 GHz induced by strain pulses.

Out-of-plane magnetization component modulated by up to 10%.

Theoretical results agree with experimental observations.

Abstract

Quasi-longitudinal and quasi-transverse picosecond strain pulses injected into a ferromagnetic (311) (Ga,Mn)As film induce dynamical shear strain in the film, thereby modulating the magnetic anisotropy and inducing resonant precession of the magnetization at a frequency ~10 GHz. The modulation of the out-of-plane magnetization component by the quasitransverse strain reaches amplitudes as large as 10% of the equilibrium magnetization. Our theoretical analysis is in good agreement with the observed results, thus providing a strategy for ultrafast magnetization control in ferromagnetic films by strain pulses.