Off-diagonal impedance in amorphous wires and application to linear magnetic sensors

Details Off-diagonal impedance in amorphous wires and application to linear magnetic sensors Off-diagonal impedance in amorphous wires and application to linear magnetic sensors

2004-02-25

arxiv.org/abs/physics/0402123v1

Physics

Instrumentation and Detectors

Accepted to IEEE Trans. Magn. (2004)

Scientific paper

10.1109/TMAG.2004.835676

The magnetic-field behaviour of the off-diagonal impedance in Co-based amorphous wires is investigated under the condition of sinusoidal (50 MHz) and pulsed (5 ns rising time) current excitations. For comparison, the field characteristics of the diagonal impedance are measured as well. In general, when an alternating current is applied to a magnetic wire the voltage signal is generated not only across the wire but also in the coil mounted on it. These voltages are related with the diagonal and off-diagonal impedances, respectively. It is demonstrated that these impedances have a different behaviour as a function of axial magnetic field: the former is symmetrical and the latter is antisymmetrical with a near linear portion within a certain field interval. In the case of the off-diagonal response, the dc bias current eliminating circular domains is necessary. The pulsed excitation that combines both high and low frequency harmonics produces the off-diagonal voltage response without additional bias current or field. This suits ideal for a practical sensor circuit design. The principles of operation of a linear magnetic sensor based on C-MOS transistor circuit are discussed.

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