Patent ID: 7976964

Claim:
A disk drive comprising: a magnetic transducer including a read and a write head positionable to read and write magnetic transitions on a magnetic thin film disk; and the magnetic thin film disk including: first and second ferromagnetic layers separated by a spacer layer that substantially decouples the first and second magnetic layers with at least one of the first and second magnetic layers further comprising: a first sublayer of ferromagnetic material of an alloy of CoCrPt including at least one element from the group consisting of boron and tantalum and having a composition of approximately 10-14 at. % Pt, 19-26 at. % Cr, 0-7 at. % boron, 0-3 at % Ta; and a second sublayer of ferromagnetic material deposited on the first sublayer having a higher boron content than the first sublayer.