Magnetic Properties of Fe-Co-Al-O Films Deposited on a Cu Underlayer

Fe–Co–Al–O soft magnetic films for main pole of CF-SPT head and underlayer of perpendicular double-layered media

“…After growing above the initial layer, the grain size measured in the lateral direction was increased and was almost the same as that of a FeCoAlO single layer film. It is reported that the mechanism of soft magnetic properties of FeCo and FeCoAlO films is grain size reduction by the effect of underlayers [4,5]. However, our result suggests that not only the structure but also the magnetism of the initial layer may be related to good soft magnetic properties of FeCoAlO/NiFe films.…”

Influence of underlayers on the soft magnetic properties of Fe–Co–Al–O films

“…Shintaku et al [3] also concluded that a soft magnetic underlayer was essential to obtain a small H ch ; the coercivity could be decreased further on addition of a small quantity of Al 2 O 3 . Recently, we revealed that a Cu underlayer significantly reduced the grain size of Fe-Co-Al-O films from $50 to $10 nm, consistent with a reduction in H ch [4]. In order to understand the origin of the soft magnetic properties of FeCo-Al-O films, we have explored the effects of varying the type of underlayer.…”

Effect of Al2O3 Additive on the Soft Magnetic Properties of High-Bs Fe-Co-Al-O Films on a Thin Underlayer

“…Fe-Co-based sputtered films are investigated as writing head core materials with a high B s for highdensity magnetic recording and a soft magnetic underlayer film for double-layered perpendicular recording media. Some groups have reported soft magnetic Fe-Co-based films with a high B s that is improved by using an additive and/or an underlayer 1)- 5) .…”