Effects of Magnetic Properties of L1_0-CoPt based Bit Patterned Media with Tilted-Easy Axis on Switching Field at Areal Density over 2 Tb/in~2

摘要

Decrease of a switching field, H_(sw), of the magnetic media with high magnetocrystalline anisotropy constant, K_u, can be handled by tilted-easy axis. Not only tilting easy direction of crystal but also optimum magnetic properties can improve writability. The effects of Ku and saturation magnetization, M_s, of L1_0-CoPt material of BPM with 45° tilted-easy axis are investigated in this article. The object oriented micromagnetic framework package based on Landau - Lifshitz - Gilbert equation has been used to analyze the magnetic properties of media in this paper. The results indicate that the H_(sw) decreases with decreasing K_u and increasing M_s. To achieve the H_(sw) lower than the maximum write head field, the K_u and M_s values should not be over 1.30 MJ/m~3 and should exceed 0.30 MA/m, respectively.