Determination of intrinsic switching field distribution in perpendicular recording media: ΔH(M,ΔM) method
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Karin A. Dahmen (UIUC), Andreas Berger (nanoGUNE, Spain, and Hitachi Global Storage Technologies, San Jose, CA) Student: Yang Liu
Objective
Understand the applicability range of the ΔH(M,ΔM) method (which is used to determine the intrinsic switching field distribution in perpendicular recording media)
Approach
Numerical studies of the ΔH(M,ΔM) method based on the zero-temperature non-equilibrium random-field Ising model.
Significant results
ΔH(MΔM) method works well at high disorder and fails at low disorder in a well-defined and universal way. Deviation from redundancy is the best measure to determine the reliability range.
Why it matters
The intrinsic switching-field distribution D(Hs) is one of the most crucial properties of magnetic recording media because it is one of the key factors defining the recording quality. Magnetic recording media use the memory of hysteretic magnetic systems to store information. The ΔH(M,ΔM) method has been used successfully in analyzing and quantifying progress in perpendicular recording media fabrication.
Funding
National Science Foundation and nanoGUNE.
The ΔH(M,ΔM) method.
