VIBRATING-WIRE MAGNETIC SUSCEPTOMETER

The growing interest in the field of nanoscale magnetic systems, espec ially regarding thin films and multilayers, emphasizes the need for se nsitive measurement techniques. A new type of magnetic susceptometer, based on an alternative field gradient, is described. The mechanical r esonating element is a long, thin, metallic wire. A complementary comp onent generates a large local field gradient while keeping the field i ntensity as low as possible. The basic configuration of a typical inst rument is presented and a general theoretical treatment is given conce rning the magnetic force, the mechanical sensitivity of the vibrating system, and the vibration sensor. (C) 1996 American Institute of Physi cs.