Title :
A theoretical study of the signal response of a shielded MR sensor [magnetic heads]
Author_Institution :
IBM Almaden Res. Center, San Jose, CA, USA
fDate :
11/1/1990 12:00:00 AM
Abstract :
A general analysis of the behavior of a shielded magnetic-field biased magnetoresistive sensor is presented. Using a transmission-line model and assuming linear magnetic behavior for the MR sensor material, the nature of the MR transfer curve and the dependence of output amplitude and asymmetry on bias levels and signal strengths is studied. Results show that, in general, there is no single optimum bias level that simultaneously maximizes the small-signal response amplitude and minimizes the positive-negative output asymmetry. As a result, in MR head designs, compromise must be made according to the relative importance of these two objectives
Keywords :
magnetic heads; asymmetry; bias levels; head designs; linear magnetic behavior; magnetic-field biased magnetoresistive sensor; output amplitude; positive-negative output asymmetry; shielded MR sensor; signal response; signal strengths; small-signal response amplitude; transfer curve; transmission-line model; Magnetic analysis; Magnetic flux; Magnetic heads; Magnetic materials; Magnetic sensors; Magnetic separation; Magnetic shielding; Sensor phenomena and characterization; Soft magnetic materials; Transmission lines;
Journal_Title :
Magnetics, IEEE Transactions on