| 摘要 |
In a magnetic disk having a magnetic layer, a protection layer, and a lubrication layer formed on a substrate in this order, a surface free energy gammaS of a surface of the magnetic disk derived by an extended Fowkes equation is greater than 0 and no greater than 24 mN/m. gammaSd (dispersion force component of surface free energy) forming the surface free energy gammaS is greater than 0 and no greater than 17 mN/m, gammaSp (dipole component of surface free energy) forming the surface free energy gammaS is greater than 0 and no greater than 1 mN/m, and gammaSh (hydrogen bonding force component of surface free energy) forming the surface free energy gammaS is greater than 0 and no greater than 6 mN/m.
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