Angle-resolved photoemission is used to determine the change in the electro
nic states of Ni induced by doping with Fe and Cr. Well-defined spin and k
states are selected using high energy and k resolution combined with single
crystal alloys. Iron suppresses the mean free path of minority spins only,
while chromium suppresses both spins and decreases the magnetic splitting.
The strong variation of these effects from one impurity to the other suppo
rts the concept of magnetic doping.