Abstract
The anisotropic magnetoresistance (AMR) in epitaxial $\mathrm{Pt}/\mathrm{Fe}/\mathrm{MgO}(001)$ bilayers was systematically studied as a function of Pt thickness, and a strong enhancement of AMR by the $\mathrm{Pt}$ layer was observed. The enhancement of AMR persists with a 1 nm Au layer inserted between $\mathrm{Pt}$ and Fe but disappears with a 1 nm $\mathrm{MgO}$ inserted layer. Both the spin Hall magnetoresistance theory and induced $\mathrm{Pt}$ moments located at the $\mathrm{Fe}/\mathrm{Pt}$ interface cannot explain the observed AMR enhancement. The enhanced AMR in the $\mathrm{Pt}/\mathrm{Fe}$ bilayer can be attributed to the $\mathrm{Pt}$ magnetic moment in the conduction band induced by the spin-polarized conduction electron, which has a long decay length of $1.7\text{--}2.6\phantom{\rule{4.pt}{0ex}}\text{nm}$.
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