Influence of Magnetic Anisotropy on Laser-induced Precession of Magnetization in Ferromagnetic Semiconductor (Ga,Mn)As

TL;DR

This study investigates how magnetic anisotropy influences laser-induced magnetization precession in (Ga,Mn)As, revealing the dependence of precession amplitude on anisotropy and methods to deduce anisotropy fields.

Contribution

It demonstrates the impact of magnetic anisotropy on precession behavior and provides a way to extract anisotropy fields from experimental data.

Findings

Precession amplitude depends on magnetic anisotropy.

Anisotropy fields can be deduced from precession frequency.

Competing cubic and uniaxial anisotropies influence the results.

Abstract

The laser-induced precession of magnetization in (Ga,Mn)As samples with different magnetic anisotropy was studied by the time-resolved magneto-optical method. We observed that the dependence of the precession amplitude on the external magnetic field depends strongly on the magnetic anisotropy of (Ga,Mn)As and we explain this phenomenon in terms of competing cubic and uniaxial anisotropies. We also show that the corresponding anisotropy fields can be deduced from the magnetic field dependence of the precession frequency.