Magnetic behavior of Na films with Fe, Co, and Ni impurities

Thin films of Na with Fe, Co, and Ni impurities are investigated. The magne tization of the impurities is measured by means of the anomalous Hall resis tance. Fe and Co show a moment of about 6 mu (B), while for Ni no moment is detected. Furthermore, the magnetic dephasing of the conduction electrons is measured by means of weak localization. The dephasing rate 1/tau (phi) o f the 3d impurities differ qualitative ly. For Fe impurities, 1/tau (phi) i s so large that it cannot be measured. For Co, 1/tau (phi) has a moderate v alue while Ni shows hardly a dephasing effect at all.