Anisotropy-graded L10 FePt(001) magnetic film obtained by graded working pressures

L1₀ FePt have been proposed as one of the potential candidates for future magnetic recording medium exceeding 1 Tbit/in.² recoding density, as it has high magnetocrystalline anisotropy (K_u). However, this well-ordered material produces a problem of writing difficulty. The reduction of the writing field may degrade the thermal stability for recording media. In order to solve the issues of writing problem and thermal stability simultaneously, the exchange-spring media and later graded media were proposed to reduce the writing field and retain the magnetic thermal stability.