Dynamic calculation of the responsivity of monodomain fluxgate magnetometers

A model is presented describing the dynamic response of a single-domain flu xgate magnetometer over a wide range of operating conditions in terms of a single measurement of a hysteresis loop or the permeability of the fluxgate 's ferromagnetic core. The model is based on the Landau-Lifshitz-Gilbert eq uation, which describes the dynamics of a coherently rotating ferromagnet, Measurements of the response of a permalloy thin-film fluxgate and a molybd enum-permalloy tube fluxgate demonstrate the accuracy and limitations of th e model.