An intelligent instrument for giant magnetoresistance sensor evaluation

A versatile and sensitive instrument has been developed that is capable of measuring the percentage change in resistance for giant magnetoresistance ( GMR) thin films as a function of applied magnetic field, drive current or t ime. The system is designed to have high resolution and minimum noise throu gh optimised design and choice of components. The resistance changes in a t hin film are detected indirectly by the system using a four-point in-line p robe or by direct measurement of patterned samples. (C) 2000 Elsevier Scien ce S.A. All rights reserved.