We have measured the temperature dependence of the extraordinary Hall effect (EHE) in ultrathin films of the itinerant ferromagnet SrRuO3. We find that while the resistivity ρ of the films varies significantly with their thickness, the EHE at low temperatures appears to be determined solely by ρ. We discuss possible implications of this observation.
Bibliographical noteFunding Information:
L.K. acknowledges support by the Israel Science Foundation founded by the Israel Academy of Sciences and Humanities. J.W.R. grew the samples at Stanford University in the laboratory of M. R. Beasley.