Depinning of nanoscale magnetic textures, such as domain walls, vortices and skyrmions, is of paramount importance for magnetic storage and information processing. We measure time-resolved magnetic switching statistics of an individual, non-single-domain Fe3O4 nanoparticle using a micrometer-scale superconducting quantum interference device. Surprisingly, a strong narrowing of the waiting-time distributions before reaching the final state is observed as compared to the exponential distribution expected for a single barrier. The magnetization reversal across the nanostructure is thus shown to result from multiple serial barriers in the minimum energy pathway.
@article{arxiv.2201.09011,
title = {Magnetization Reversal Across Multiple Serial Barriers in a Single Fe$_3$O$_4$ Nanoparticle},
author = {Sagar Paul and Ganesh Kotagiri and Rini Ganguly and Annapoorni Subramanian and Hervé Courtois and Clemens B. Winkelmann and Anjan K. Gupta},
journal= {arXiv preprint arXiv:2201.09011},
year = {2023}
}
Comments
5 pages and suppl information available on request