We investigated the effect of ion irradiation on the wear of carbon fi
lms prepared by electron-cyclotron-resonance plasma (ECR) sputtering.
The wear durability of the ECR-sputtered films was far superior to tha
t of the RF-sputtered films. ECR- sputtered films made with a high ene
rgy ion irradiation showed the highest wear resistance, nearly equal t
o that of bulk diamond. We attribute this high durability to selective
etching;of the weakly bonded carbon atoms by the high-energy ion irra
diation.