Hilbert filter for double-layer perpendicular recording media

Hiroaki Muraoka*, Martin Hassner, Yoshiaki Sonobe, Hideaki Nemoto, Satoshi Yamamoto, David Berman, Augusto Rossi, Yoshihisa Nakamura

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


Signal equalization using a Hilbert filter for perpendicular double-layer media in association with a geometric mean radius reader is described. A theoretical approach is presented based on reciprocity, which reveals that the equalization is equivalent to the longitudinal transformation of a magnetization vector. Thus, a readback step-like response from the perpendicular media is transformed into a singie-peak pulse. At high frequencies, no gain boost takes place, in contrast to differentiators. Results of spin-stand testing with an finite-impulse response Hilbert filter are also described.

Original languageEnglish
Pages (from-to)2337-2339
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number5 I
Publication statusPublished - 2002 Sept
Externally publishedYes
Event2002 International Magnetics Conference (Intermag 2002) - Amsterdam, Netherlands
Duration: 2002 Apr 282002 May 2


  • Differentiator
  • Double-layer perpendicular media
  • Hilbert filter
  • Perpendicular magnetic recording

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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