Rashba interfaces yield efficient spin-charge interconversion and give rise to nonreciprocal transport phenomena. Here, we report magnetotransport experiments in few-nanometer-thick films of PdCoO2, a delafossite oxide known to display a large Rashba splitting and surface ferromagnetism. By analyzing the angle dependence of the first- and second-harmonic longitudinal and transverse resistivities, we identify a Rashba-driven unidirectional magnetoresistance that competes with the anomalous Nernst effect below the Curie point. We estimate a Rashba coefficient of 0.75 {\pm} 0.3 eV {\AA} and argue that our results qualify delafossites as a new family of oxides for nano-spintronics and spin-orbitronics, beyond perovskite materials.
@article{arxiv.2109.14503,
title = {Nonreciprocal transport in a Rashba ferromagnet, delafossite PdCoO$_2$},
author = {Jin Hong Lee and Takayuki Harada and Felix Trier and Lourdes Marcano and Florian Godel and Sergio Valencia and Atsushi Tsukazaki and Manuel Bibes},
journal= {arXiv preprint arXiv:2109.14503},
year = {2021}
}