Emergent magnetic fields exerted by topological spin textures of magnets lead to an additional Hall response of itinerant carriers called the topological Hall effect (THE). While THE as a bulk effect has been widely studied, THE driven by magnetic domain boundaries (DBs) has been elusive. Here, we report rich Hall responses characterized by multiple peak structures and a hysteresis loop in films of EuCd2, where Eu layers form a geometrically frustrated lattice of Heisenberg spins. We uncover a THE component sharply enhanced at magnetic transition fields, indicating a giant contribution from non-trivial spin textures possibly formed at the DBs.
@article{arxiv.2407.13345,
title = {Topological Hall effect enhanced at magnetic transition fields in a frustrated magnet EuCd$_2$},
author = {S. Nishihaya and Y. Watanabe and M. Kriener and A. Nakamura and M. Uchida},
journal= {arXiv preprint arXiv:2407.13345},
year = {2024}
}