Limitations of an amorphous-metal magnetometer operated by modulating the magnetostrictive strain

Abstract

An analysis is presented of the characteristics of a magnetometer which uses an amorphous-metal ribbon as its primary sensing element and which operates by modulating the magnetostrictive strain. Magnetic fields at the second harmonic of the modulation frequency are identified as capable of significantly degrading the magnetometer performance. A second-harmonic field is measured and its contribution to the noise is estimated.

A high sensitivity magnetometer via the combination of ultrahigh-Q fiber cavity and frequency-locking technology

“…Without considering the anisotropy of magnetostrictive materials, the peak sensitivity of the magnetic sensor system combined with Eq. ( 3) can be expressed as: 22,25,26) w…”

Shifting the operating frequency of magnetoelectric sensors

“…8 Here we describe using a time varying magnetic field to increase the operating frequency of ME sensors. Because of the nonlinearity of the bias response of magnetostrictive materials, 9 the time varying magnetic field has the effect of increasing the operating frequency of ME sensors. For itinerant systems, 10,11 the magnetostrictive response is given by…”