Transport properties of Cu/Permalloy artificial layers

We have measured the electrical resistance R of wires and foils of thin art ificial Cu/Permalloy (NiFe) layers in the temperature range from 0.1K to 20 0K under magnetic fields up to 10 tesla, and the thermoelectric power S fro m 2K to 200K. The logarithmic increase of R in the low temperature range (b elow 20K for example) was observed for all the present samples. This increa se of R was found to stay unchanged even under a strong magnetic field of a s much as 10 tesla. The curves of S as a function of temperature T showed a normal metal behavior without any Kondo type anomaly. Possible origins of the logarithmic increase of R are discussed.