Noise dependence on temperature in fluxgates with electroplated core

Abstract

Samples of electrodeposited fluxgate sensors with varying magnetostriction coefficient were manufactured and their noise was studied at various temperatures. We show that the noise of the fluxgate is, under some conditions, dependent on temperature. We studied such behaviour of the noise for samples with low and high magnetostriction and we verified that the both types of sensors presented low and high temperature dependent noise. Then we investigated as a possible source of noise the thermal cooling rate applied to the samples after electroplating and we verified that large thermal shock could induce mechanical stress and noise in the sensor.