Title :
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
fDate :
9/1/1999 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
