Multiple layer FePt structure

A method for forming a recording medium, comprising:

• providing a disc-shaped substrate;
• forming a seed layer supported by the substrate by depositing a first material comprising A1 phase FePt with a ratio of Pt to Fe greater than 1:1;
• forming a main layer supported by the seed layer by depositing a second material comprising A1 phase FePt with a ratio of Pt to Fe of approximately 1:1;
• forming a cap layer supported by the main layer by depositing a third material comprising A1 phase FePt with a ratio of Pt to Fe of less than 1:1;
• and
• annealing the seed, main and cap layers to convert the A1 phase FePt to L10 phase FePt having a graded FePt structure of varying stoichiometry from a ratio of Pt to Fe of approximately 1:1 adjacent a lower portion of the structure to a ratio of Pt to Fe of less than 1:1 adjacent an upper portion of the structure opposite the lower portion.