Recrystallization texture, epitaxy, and magnetic properties of electrodeposited FePt on Cu(001)

A near-equiatomic FePt face-centered-cubic alloy has been grown by electrodeposition onto Cu(001). Annealing at $450°C$ results in the onset of a $A1$ fcc to $L10$ face-centered-tetragonal phase transformation with a dominant $FePt(001)⟨100⟩‖Cu(001)⟨100⟩$ recrystallization texture, possibly driven by the reduced ordering temperature in an FePtCu intermixed interface region. Further annealing at $650°C$ leads to a more complete transformation, and magnetic measurements indicate that high perpendicular coercivities, of up to $10kOe$⁠, are accessible through the recrystallization reaction. The magnetic and structural properties reported in this work may allow electrodeposited FePt to play a leading role in future ultrahigh-density patterned perpendicular magnetic media.