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In this paper, a fast algorithm for the rapid calculation of the demagnetization field in micromagnetic modeling is presented. The method is applied to finite element micromagnetic modeling to study the switching phenomenon of perpendicular recording media. The method is shown to provide high efficiency in the numerical simulation with reduced memory requirement. With significant improvement in the computing speed, the practical application of recording physics based simulations can be extended to the investigation of perpendicular magnetic recording processes in various aspects, for instance, a large number of micromagnetic simulations can be carried out to build microtrack model and to predict the performance of perpendicular head and media combinations. [ABSTRACT FROM AUTHOR]

In this article, an analytical solution for the write field distribution in perpendicular recording system is presented. The field distribution in soft underlayer has been taken into consideration. The computed results agree well with numerical simulations. To investigate the influence of the leading design parameters on the write field characteristics, the sensitivity analysis based on response surface methodology is carried out. Besides, the effect of the soft underlayer on the write field is also studied to provide guidelines for the perpendicular recording head design. [ABSTRACT FROM AUTHOR]

This paper presents numerical simulation of high-density magnetic recording process with perpendicular head and media. The simulation is based on three-dimensional micromagnetic model of the media and an analytical model of the single pole perpendicular recording write field. The physical problem is modeled with a hybrid FEM-BEM formulation and the evaluation is accelerated using a new Fast Fourier Transform on Multipoles method. The model is suitable for studying magnetization transition configuration in perpendicular media with softmagnetic underlayer, and in turn can be used to derive microtrack model for evaluating the performance of recording systems. [ABSTRACT FROM AUTHOR]

This paper describes the implementation of the fast Fourier transform on multipole (FFTM) algorithm for rapid calculation of magnetostatic fields in micromagnetics. The method is based on the multipole approximation theory, in which the computation-intensive transformation operations of the multipole in local expansions are accelerated by using FFT algorithms. Hence, this algorithm has the computational efficiency of the FFT-based approach, but is not confined to use in problems with regularly spaced elements. [ABSTRACT FROM AUTHOR]

This paper presents numerical simulation of the write and read process based on self-organized magnetic array (SOMA) media to study the particle-array misalignment effects on recording performances. The simulation is based on a three-dimensional finite element micromagnetic model of the media and an analytical model of the single pole perpendicular recording write field. The physical problem is modeled with a hybrid finite-element method-boundary-element method formulation, and the evaluation is accelerated using a new fast Fourier transform on multipoles method. The results show the lowest signal and signal-to-noise ratio occur at the best alignment situation, which is to be accepted as the intrinsic characteristic for SOMA media. [ABSTRACT FROM AUTHOR]

The write field distribution for a perpendicular writer was investigated using finite-element (FE) analysis. The slanted write fields due to shield pieces at the trailing edge and the leading edge of the pole tip, and the side shields are analyzed. The analysis shows that the use of the shielded pole leads to a change in the saturation levels in the main pole tip, affecting the write field distribution. The effects of the side shield and other design parameters on the write field in cross-track direction are discussed. [ABSTRACT FROM AUTHOR]