Abstract
The magnetoresistance (MR) of the single-crystalline Co/Pt(111) bilayers was studied systematically as a function of Co or Pt thickness at room temperature. For Co thickness dCo < 6 nm, the resistances with in-plane magnetization M parallel (R∥) and transverse (R⊥) to current and with a perpendicular M normal (RP) to film show the unconventional behavior of RP>R∥>R⊥. This MR behavior can be attributed to the combination effect of spin Hall MR with RP≈R∥>R⊥ and the geometrical size effect. In addition, the angular dependent magnetoresistance behavior of the (111)-oriented Co/Pt bilayer shows striking difference with that of the (001)-oriented Co/Pt bilayer.
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