Long range electron spin polarization in the Ag layer of a Fe/Ag film

The depth dependence of the induced electron spin polarization below the magnetic interface of an epitaxial 4 nm Fe/300 nm Ag(0 0 1) bilayer has been investigated by means of low energy muon spin rotation (LE-μSR, Appl. Magn. Reson. 13(1997) 219). The mean stopping depth of the muons in the Ag layer can be tuned between 10 and 110 nm. A long range spin polarization is deduced from the μSR data. These measurements complement earlier investigations on a 4 nm Fe/20 nm Ag/4 nm Fe(0 0 1) trilayer (Phys. Rev. Lett. 91 (2003) 017204)