Effective reduction of PdCoO2 thin films via hydrogenation and sign tunable anomalous Hall effect

Abstract

PdCoO2 , belonging to a family of triangular oxides called delafossite, is one of the most conducting oxides. Its in-plane conductivity is comparable to those of the best metals, and exhibits hydrodynamic electronic transport with extremely long mean free path at cryogenic temperatures. Nonetheless, it is nonmagnetic despite the presence of the cobalt ion. Here, we show that a mild hydrogenation process reduces PdCoO2 thin films to an atomically-mixed alloy of PdCo with strong out-of-plane ferromagnetism and sign-tunable anomalous Hall effect. Considering that many other compounds remain little affected under a similar hydrogenation condition, this discovery may provide a route to creating novel spintronic heterostructures combining strong ferromagnetism, involving oxides and other functional materials.

References in corpus (7)

• Evidence for hydrodynamic electron flow in PdCoO${}_2$
• The properties of ultrapure delafossite metals
• Itinerant ferromagnetism of the Pd-terminated polar surface of PdCoO${}_2$
• Growth of metallic delafossite PdCoO2 by molecular beam epitaxy
• Reversal of the extraordinary Hall effect polarity in thin Co/Pd multilayers
• Large anisotropic thermal conductivity of intrinsically two-dimensional metallic oxide PdCoO${}_2$
• Anomalous Hall effect at the spontaneously electron-doped polar surface of PdCoO2 ultrathin films

Cited by in corpus (2)

• Emergent magnetism with continuous control in the ultrahigh conductivity layered oxide PdCoO2
• Anomalous Hall effect in electrolytically reduced PdCoO${}_2$ thin films