Magnetic Characteristics of Initial Deposition Layer of CoCr Thin Films

New information is presented on the initial deposition layer of CoCr film which is divided into three regions. In the first region, up to 300 Å from the substrate, H_c⊥ and M_s are small, crystallization is disturbed and there is no perpendicular anisotropy. From 300 Å to 0.1 μm, H_c⊥ and M_s are very large, suggesting that this layer is formed of segregated Cr fine grains. Above 0.1, μm the H_c⊥ curve gently slopes down as the film thickness increases, M_s is constant, and the crystal orientation is good. Thus, it was confirmed that there is an intermediate level within the initial formation layer of CoCr films which has very large H_c⊥ and M_s values.