Nonreciprocal Transport in a Rashba Ferromagnet, Delafossite PdCoO2

Jin Hong Lee, Takayuki Harada, Felix Trier, Lourdes Marcano, Florian Godel, Sergio Valencia, Atsushi Tsukazaki, Manuel Bibes

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

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 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 ± 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.

Original languageEnglish
Pages (from-to)8687-8692
Number of pages6
JournalNano Letters
Volume21
Issue number20
DOIs
Publication statusPublished - 2021 Oct 27

Keywords

  • Rashba-type spin-orbit interaction
  • delafossite nanofilms
  • magnetoresistance
  • nonreciprocal transport
  • surface and interfacial phenomena
  • surface ferromagnetism

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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