A Study of TDMR Signal Processing Opportunities Based on Quasi-Micromagnetic Simulations

Author

Vasic, Bane ; Khatami, Mehrdad ; Nakamura, Yasuaki ; Okamoto, Yoshihiro ; Kanai, Yasushi ; Barry, John R. ; McLaughlin, Steven W. ; Sadeghian, Elnaz Banan

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Arizona, Tucson, AZ, USA

Volume

51

Issue

4

fYear

2015

fDate

Apr-15

Firstpage

1

Lastpage

7

Abstract

This paper presents the results of a comprehensive study of the shingled writing process and various signal processing and data detection approaches applied to the readback waveforms. The recording simulations include realistic head fields, a random granular media, magnetostatic and exchange interactions, and a READ head sensitivity function. Readback waveforms are examined in both one and two dimensions in terms of signal characteristics (linear and nonlinear), noise behavior (stationary and signal-dependent), and intertrack interference. Different equalization and detection approaches are compared and about a 10% density gain is reported for such 2-D magnetic recording compared with traditional single-track recording. These gains depend strongly on the number of readers, the reader positioning, and the reader width.

Keywords

exchange interactions (electron); magnetic heads; magnetic recording; micromagnetics; 2D magnetic recording; TDMR signal processing; data detection; density gain; equalization approach; exchange interactions; intertrack interference; magnetostatic interactions; noise behavior; quasimicromagnetic simulations; random granular media; read head sensitivity function; readback waveforms; reader number; reader positioning; reader width; realistic head fields; shingled writing process; Detectors; Equalizers; Magnetic heads; Magnetic recording; Media; Noise; Sensitivity; 2-D magnetic recording (TDMR); data-dependent noise; intersymbol interference (ISI); multitrack equalization and detection; shingled magnetic recording;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2014.2356455

Filename

7109973