Unexpected Universality in Disordered Systems and Modeling Perpendicular Recording Media
Liu, Yang
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https://hdl.handle.net/2142/80600
Description
Title
Unexpected Universality in Disordered Systems and Modeling Perpendicular Recording Media
Author(s)
Liu, Yang
Issue Date
2009
Doctoral Committee Chair(s)
Hubler, Alfred
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Condensed Matter
Language
eng
Abstract
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.
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