Determination of intrinsic switching field distribution in perpendicular recording media: ?H(M,?M) method

1
Determination of intrinsic switching field
distribution in perpendicular recording media
?H(M,?M) method

• Objective Understand the applicability range of
  the ?H(M,?M) method (which is used to determine
  the intrinsic switching field distribution in
  perpendicular recording media)
• Approach Numerical studies of the ?H(M,?M)
  method based on the zero-temperature
  non-equilibrium random-field Ising model.
• Significant results ?H(M?M) 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 ?H(M,?M) method has been used
  successfully in analyzing and quantifying
  progress in perpendicular recording media
  fabrication.
• Principal Investigators Karin A. Dahmen (UIUC),
  Andreas Berger (nanoGUNE, Spain, and Hitachi
  Global Storage Technologies, San Jose, CA)
  Student Yang Liu
• Funding National Science Foundation and
  nanoGUNE.

The ?H(M,?M) method.