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The magnetic moment of Fe was found to depend sensitively on the environment such as the surface, relaxation, and atomic composition while that of Ni does not change much. The large induced magnetic moment of Ta and its magnetic ordering changed strongly as the surface layer implies a possible new finding of 5d magnetism.

The incomplete magnetization switching that takes place between two recorded transitions in perpendicular magnetic recording is studied with the help of a micromagnetic model. The impact of the incomplete switching in the media signal-to-noise ratio is studied and the transition parameter calculated to evaluate the transition noise and dc noise under complete and incomplete switching conditions.

The response of a trailing shielded perpendicular magnetic recording (PMR) write head with a three-turn two-layer coils is calculated using a full micromagnetic large scale model including return pole and soft underlayer. We study the effect of PMR yoke length and write current overshoot on the dynamic response of the head at high frequency. In particular, recording performance parameter, nonlinear transition shift (NLTS) is simulated using micromagnetic media model. Shorter yoke length head improves NLTS as compared with longer yoke length. Measured NLTS has qualitative agreement with micromagnetic model results. [ABSTRACT FROM AUTHOR]

Adjacent track erasure in longitudinal recording was studied using a micromagnetic model. The gap and fringe fields of two heads designed to work for 100 kTPI were used to write and erase a 31-bit pseudorandom sequence (PRS) in the main track. Comparisons on recording performance were made based on the calculated magnetization profile and the equalized PRS read back signal. It was shown that, for the case of a 3800-Oe fringe field, the quality of the transitions degraded drastically when the transitions were exposed to the fringe field more than 1000 times. On the other hand, a 2000-Oe fringe field left unaffected transitions even when the transitions were exposed to the field more than 100 000 times. [ABSTRACT FROM AUTHOR]

Provides information on a study that analyzed the recording performance of longitudinal thin film media with antiferromagnetically coupled underlayers. Factor that limits areal density in magnetic recording; Methodology; Results and discussion.