Unexpected Universality in Disordered Systems and Modeling Perpendicular Recording Media

In state-of-the-art storage applications such as hard disk drives, the intrinsic switching field distribution of the media grains is one of the most crucial properties defining the recording quality. However, this piece of microscopic information is very hard to measure macroscopically, especially for the perpendicular recording media. Using the interacting random hysteron model, we have studied the reliability of the recently developed Delta H(M, DeltaM) method. We demonstrated that this method does have several advantages over comparable methods. First, it has a well-defined reliability range and it allows for self-consistency checks. Second, the presence of dipolar interactions in the range of typical recording media substantially enhances the reliability of this method. Third, it is robust even in the presence of randomness in exchange or magnetostatic coupling within the range of a typical recording media.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Liu, Yang

Contributors dc:contributor

• Hubler, Alfred

• Physics, Condensed Matter

Language dc:language

eng

Identifier

(MiAaPQ)AAI3363021

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/80600