Micromagnetic model analysis of high frequency heat-assisted magnetic recording

Abstract

FEM-boundary integral method micromagnetic software was used to analyze the recording field response of an indented magnetic head to high frequency recording currents (1–4 GHz). Next, micromagnetic simulations of heat-assisted magnetic recording were performed and the signal-to-noise ratio (SNR) calculated at high frequencies. With a soft magnetic underlayer, the head field was large enough and gave higher SNRs. The large head field strength at low frequency did not cause any deterioration of the SNR.

Granular micromagnetic HAMR model: investigation of damping dependence and parametric optimization for high performance

“…In order to improve the areal density of magnetic recording technology, the writability, noise source, and bit error rate (BER) must be optimized. To examine magnetic characteristics and investigate the dynamics of magnetic grains, standard micromagnetic techniques based on the Landau Lifshitz-Gilbert (LLG) equation of motion [24,25] have been widely employed. This method conserves magnetization length, and when computed at high temperatures.…”

Coding and signal processing for high density granular magnetic recording systems

“…This tool has been extensively applied to magnetic recording scenario and much work has been done by others on micromagnetic simulation of various magnetic recording systems [14][15][16] [17]. In [14] and [15] for example, the authors use micromagnetic simulations to estimate the attainable areal density for SMR using various new writer and reader heads.…”

“…This is proposed in Chapter 6 of the thesis. (2.30) [17]. While this model provides an in-depth prediction of magnetic behaviors and interactions within an isolated channel, its high computational time makes it unsuitable for a system level study of a new magnetic recording scenario.…”