Magnetic skyrmions are topologically protected spin textures that are promising candidates for low-power spintronic memory and logic devices. Realizing skyrmion-based devices requires an understanding of how structural disorder affects their stability and transport properties. This study uses Ne+ ion irradiation at fluences from 1011 to 1014 ions-cm−2 to systematically vary defect densities in 80 nm epitaxial FeGe films and quantify the resulting modifications to magnetic phase boundaries and electronic scattering. Temperature- and field-dependent Hall measurements reveal that increasing disorder progressively extends the topological Hall signal from a narrow window near 200\~K in pristine films down to 4\~K at the highest fluence, with peak amplitude more than doubling. Simultaneously, the anomalous Hall effect transitions from quadratic Berry curvature scaling to linear skew scattering behavior, with the skew coefficient increasing threefold. These results establish quantitative correlations between defect concentration, skyrmion phase space, and transport mechanisms in a chiral magnet. It demonstrates that ion-beam modification provides systematic control over both topological texture stability and electrical detectability.
@article{arxiv.2511.05008,
title = {Disorder-broadened topological Hall phase and anomalous Hall scaling in FeGe},
author = {Chaman Gupta and Chris Matsumura and Hongbin Yang and Sarah Edwards and Rebeca M. Gurrola and Jiun-Haw Chu and Hanjong Paik and Yongqiang Wang and David A. Muller and Robert Streubel and Tzu-Ming Lu and Serena Eley},
journal= {arXiv preprint arXiv:2511.05008},
year = {2025}
}