Observation of Spin Wave Soliton Fractals in Magnetic Film Active Feedback Rings

TL;DR

This paper reports the first observation of fractal patterns in spin wave soliton dynamics within a magnetic film feedback ring, revealing complex self-similar structures in the soliton behavior and spectrum.

Contribution

It introduces the experimental observation of fractal behavior in spin wave solitons, a novel phenomenon in magnetic systems.

Findings

Fractal patterns appear in soliton dynamics at high gain.

Power spectrum exhibits a recursive comb structure.

Soliton breathes in a fractal pattern.

Abstract

The manifestation of fractals in soliton dynamics has been observed for the first time. The experiment utilized self-generated spin wave envelope solitons in a magnetic film based active feedback ring. At high ring gain, the soliton that circulates in the ring breathes in a fractal pattern. The corresponding power frequency spectrum shows a comb structure, with each peak in the comb having its own comb, and so on, to finer and finer scales.