Novel system design for readback at 10 terabits per square inch user areal density

Yao Wang, M. F. Erden, R. H. Victora

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

A novel system design for sensing very high density magnetic recording data, such as that envisioned for two-dimensional magnetic recording, is proposed. The key idea is a rotated sense head, so that the shields are aligned down-track, combined with oversampled signal processing to regain the lost down-track resolution. Based on a random Voronoi grain model, simulation indicates that for bits with dimension of 8 nm × 6 nm, 5.5 nm grains, and a reader with 4 nm × 18 nm × 18 nm free layer and 11 nm shield-shield spacing, the bit error rate can drop from 20.9% for a normally positioned head array to 4.2% for a single-rotated single head with sampling period of 2 nm, a minimum mean squared error equalizer, and pattern-dependent noise prediction detector. The user density computed using the Shannon capacity limit is greatly increased to 10.1 Tb/in2.

Original languageEnglish (US)
Article number6389782
JournalIEEE Magnetics Letters
Volume3
DOIs
StatePublished - 2012

Keywords

  • Information storage
  • exchange-coupled composite (ECC) media
  • magnetoresistive head
  • pattern-dependent noise prediction detection (PDNPD)
  • two-dimensional (2-D) magnetic recording (TDMR)

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