Generation of magnonic spin wave traps

TL;DR

This paper investigates how laser-induced temperature gradients affect the propagation of spin wave modes in magnonic crystals, revealing that such gradients can hinder expected wave propagation behaviors.

Contribution

It demonstrates that laser-generated temperature profiles significantly influence spin wave dynamics, especially in magnonic crystals, highlighting the impact of thermal effects on magnonic device performance.

Findings

Spin wave frequencies depend on distance from laser pump center.

Temperature gradients can frustrate spin wave propagation.

Laser-induced thermal effects alter magnonic mode behavior.

Abstract

Spatially resolved measurements of the magnetization dynamics induced by an intense laser pump-pulse reveal that the frequencies of resulting spin wave modes depend strongly on the distance to the pump center. This can be attributed to a laser generated temperature profile. On a CoFeB thin film magnonic crystal, Damon-Eshbach modes are expected to propagate away from the point of excitation. The experiments show that this propagation is frustrated by the strong temperature gradient