Patent ID: 6805941
Filing Date: 2004-10-19
Classification: G11B,Y10T

Abstract:
A hard disk device comprising:a magnetic head; a substrate; a magnetic film being provided on the substrate; a protective film being provided on the magnetic film and comprising diamond-like carbon, wherein the protective film includes at least a first element selected from the group consisting of silicon, germanium, tin and lead at a concentration of 20 atomic % or less, wherein a concentration of the first element at a first portion of the protective film is higher than a concentration of the element at a second portion of the protective film, wherein the first portion is closer to the substrate than the second portion, wherein the protective film comprises hydrogen at a concentration in a range of 10 to 60 atomic %, wherein a center line average roughness of the protective film is 30 nm or less, wherein the protective film includes at least a second element selected from Group III and Group V elements.