Challenges in Magnetic Recording Media

Abstract: The conventional magnetic recording approached the physical frontiers of the recording density. The magnetic recording must face a famous trilemma: In order to increase the recording density, smaller grain volumes are needed, but in order to ensure the thermal stability of recorded information, the anisotropy should be increased accordingly; which requires higher writing fields that are unavailable with the magnetic materials of the current heads. Perpendicular magnetic recording has made huge progress, resulting in high-density disk drive products, but still remain important factors limiting its performance, as the superparamagnetic effect and the jitters that lower the SNR. The anisotropy of the granular media, the saturation induction of existing materials, and the geometry of the magnetoresistive heads are the main factors that determine the jitter configuration. With the current values of these parameters, the conventional perpendicular recording (CPR) is limited to a density of about 1 Tb/in2. The writability problem can be solved using various assisting methods: domain-wall-, heat-, and microwave-assisted reversal methods. To overcome the main drawbacks of CPR, many solutions for the media structures were proposed. This presentation is devoted to a short analysis of the most promising among them: patterned recording media, coupled granular/continuous media, and exchange coupled composite media. Challenges and possible improvements are summarized.

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