Unshielded Perpendicular Recording Head for 1 Tb/in2

Mohammed S. Patwari, Randall H. Victora

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


A full three-dimensional (3-D) self-consistent micromagnetic code has been employed to design an unshielded perpendicular writer for an areal density of 1 Tb/in2. The head consists of a probe-type tip protruding from a collar. The tip has saturation magnetization (MS) of 24 kG while the collar has lower MS. The magnitude and orientation of anisotropy field (Hk) in the tip is varied to obtain the best recording performance. The combination of high anisotropy write tip with low M s collar is shown to produce effective write fields in excess of 19 kOe and less than 20% track erasure for 107 passes. Introduction of in-plane anisotropy within the pole tip reduces head remanence sufficiently that on-track era-sure exceeds a benchmark of 108 passes. The damping constant in Landau-Lifshitz-Gilbert equation has been varied to improve the frequency response. With damping constant equal to 1.0, simulations show that the head is capable of switching in approximately 0.15 ns.

Original languageEnglish (US)
Pages (from-to)247-252
Number of pages6
JournalIEEE Transactions on Magnetics
Issue number1 II
StatePublished - Jan 1 2004


  • Adjacent track erasure
  • On-track erasure and frequency response
  • Perpendicular recording


Dive into the research topics of 'Unshielded Perpendicular Recording Head for 1 Tb/in<sup>2</sup>'. Together they form a unique fingerprint.

Cite this