Thermal decay of signal and noise in high-density thin-film media

Author

Zhang, Yun ; Bertram, H. Neal

Author_Institution

Center for Magnetic Recording Res., California Univ., San Diego, La Jolla, CA, USA

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

4326

Lastpage

4338

Abstract

A combined experimental and theoretical study of signal and noise decay in a thin-film longitudinal medium is described. The experimental results show that medium noise power increases with time while signal power decreases, resulting in a degradation of signal-to-noise ratio (SNR). A medium noise model is developed. By utilizing this model in combination with a previous model of magnetization decay, noise power and SNR decays are calculated. Good agreement between calculations and experimental results is obtained. Theoretical estimates of the dependence of the thermal decay of SNR with temperature and average grain size are given for a high-density system

Keywords

hard discs; magnetic recording noise; magnetic thin film devices; magnetisation; average grain size; high-density system; high-density thin-film media; longitudinal medium; magnetization decay; medium noise power; signal power; signal-to-noise ratio; thermal decay; Grain size; Magnetic noise; Magnetic recording; Magnetization; Noise measurement; Power system modeling; Signal to noise ratio; Thermal degradation; Time measurement; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.799083

Filename

799083