Nonreciprocal Transport in a Rashba Ferromagnet, Delafossite PdCoO<sub>2</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 34613718.
- Also identified by DOI 10.1021/acs.nanolett.1c02756.
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Abstract
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 PdCoO<sub>2</sub>, 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 ± 0.3 eV Å and argue that our results qualify delafossites as a new family of oxides for nanospintronics and spin-orbitronics, beyond perovskite materials.