Mean Interaction Field in Magnetic Recording Media

Microstructure of a Co/Pd multilayered perpendicular recording medium with Pd seeds prepared by electrochemical process

“…Table 2 shows the values of perpendicular coercivity (H c ) and loop slope parameter, a; of media I and II. The a value, defined as 4pðdM=dHÞ H¼H c ; has been reported to reflect the strength of intergranular exchange coupling in a Co/Pd multilayered film [7]. Medium I with the Pd (b) show MFM images at ACdemagnetized states of media I and II.…”

Moving vector Preisach hysteresis model and δM curves

“…8 The major loops in the longitudinal and transverse direction show little difference between the two models (Fig.5). The two models have been used in self-consistent field computations.…”

“…Because of the non-spherical shape of the barium femte particles and of the non-uniform distribution of their easy axes there is no reason for the feedback to be the same in the longitudinal and transverse directions. A recent theoretical study [8] suggests a positive feedback in the longitudinal direction and a wcak negative one in the transverse direction. This is consistent with the angular dependence experimentally mcasured by Mayo et al [2]; 6M curves are found to be positive when the field is applied longitudinally and to be negative when the field is applied in the transverse direction.…”

Improvement of magnetic intergranular isolation and evaluation of read/write characteristics on SmCo5 perpendicular magnetic thin films

“…Finally, we examined the R/W characteristics of the media. The layer configuration of the media was C(7.5 nm)/Sm-Co(8 nm)/ Cu(5 nm)- Ta for the R/W measurements are listed in [24,25]. A small value of a corresponded to a small intergranular exchange coupling.…”