It was recently reported that hydrogen-reduced PdCoO2 films exhibit strong perpendicular magnetic anisotropy (PMA) with sign tunable anomalous Hall effect (AHE). Here, we provide extensive thickness-dependent study of this system, and show that the electronic and magnetic properties are strongly dependent on the thickness and annealing conditions. Below a critical thickness of 25 nm, AHE shows clear PMA with hysteresis, and its sign changes from positive to negative, and back to positive as the annealing temperature increases from 100 ∘C to 400 ∘C. Beyond the critical thickness, both PMA and AHE hysteresis disappear and the AHE sign remains positive regardless of the annealing parameters. Our results show that PMA may have a large role on AHE sign-tunability and that below the critical thickness, competition between different AHE mechanisms drives this sign change.
@article{arxiv.2306.01979,
title = {Thickness-dependent, tunable anomalous Hall effect in hydrogen-reduced PdCoO$_2$ thin films},
author = {Gaurab Rimal and Yiting Liu and Matthew Brahlek and Seongshik Oh},
journal= {arXiv preprint arXiv:2306.01979},
year = {2023}
}