Abstract
A technique to determine experimentally the reader resolution in magnetic recording by using pseudo-random sequence (PRS) patterns written on the disc is presented. The spectrum of the PRS signal is analyzed to extract simultaneously the width of the magnetic transitions and the reader sensitivity as a function of frequency. When playback spacing is increased, reader sensitivity rolls off faster with frequency, in good quantitative agreement with modeling results involving micromagnetic simulation of the reader. The reader sensitivity is further employed to de-convolve the magnetic cluster size from measured spectra of media noise.
Highlights
Improvements in performance of recording media are pursued by seeking better segregation of the magnetic grains
Read back signal is the convolution between the reader sensitivity function and media magnetization pattern V = R ∗ m
We present here a new way to measure the reader sensitivity, by capturing and analyzing the spectra of pseudo-random sequence (PRS) patterns
Summary
Improvements in performance of recording media are pursued by seeking better segregation of the magnetic grains. The size of the magnetic cluster is measured on the spin-stand tester,[1] by reading the signal from the disc. Read back signal is the convolution between the reader sensitivity function and media magnetization pattern V = R ∗ m. By employing the reader sensitivity functions previously measured, we extract a media cluster size which is independent of spacing. This validates our technique of measuring the reader resolution.
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