Dynamics of perpendicular recording heads

Abstract

Abstract-3D modeling and inductance measurements were used to design an ultra-high frequency perpendicular system. Kerr microscopy and spin-stand experiments with focused ion beam (FIB) trimmed perpendicular heads and perpendicular media directly verified the high frequency concepts.Index Terms-Focused ion beam (FIB), next generation magnetic recording systems, perpendicular recording dynamics.

Recording layer influence on the dynamics of a soft underlayer

“…The influence of a SUL on the dynamic characteristics of a recording system remains one of the open questions pertinent to the development of the technology. A detailed study of the SPH/SUL dynamics can be found in [7]. The present paper extends the analysis to include the influence of a recording layer on the SUL dynamic properties.…”

Three-Dimensional Magnetic Recording Device

“…The relative exchange coupling constant, he, was modeled to be anisotropic: with the in-plane and perpendicular-to-the-plane exchange constants equal to 0.05 and 0.5 for Co-based "single" layer, respectively, and 0.1 and 0.5 for Co/Pt-based "single layer, respectively. Figure 3c illustrates a micromagnetically simulated magnetization pattern [6] after applying the recording field from a single pole head to a stack of multilayers with an interlayer separation (Pt layer thickness) of less than one nanometer. The field from the single pole head was also modeled micromagnetically.…”