Title :
Perpendicular magnetic recording of analog signals by means of pulse width modulation
Author :
Fujiwara, T. ; Yamamori, K.
Author_Institution :
Toshiba R&D Center, Komukai, Kawasaki, Japan
fDate :
11/1/1982 12:00:00 AM
Abstract :
A pulse width modulation (PWM) recording, which effectively utilizes the perpendicular recording feature, is proposed to record analog signals on perpendicular media. Experimentally obtained PWM recording results showed a good linearity in a wide signal frequency range, even at high modulation levels. Frequency response curve for a double-layer (Co-Cr/Fe-Ni) medium differs from that for a single-layer (Co-Cr) medium. This difference is explained by the backlayer (Fe-Ni) flux-sink effect in the double-layer medium.
Keywords :
Magnetic recording/recording materials; Pulse-width modulation; Bandwidth; Frequency modulation; Low pass filters; Magnetic modulators; Magnetization; Perpendicular magnetic recording; Phase change materials; Pulse width modulation; Signal resolution; Space vector pulse width modulation;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.1982.1062097