Get rights and content • • • • Previous Next Sensors and Actuators A: Physical Volume 244, 15 June 2016, Pages 310-313 Noise dependence on temperature in fluxgates with electroplated core ☆ Mattia Butta , Michal Přibil, Pavel Ripka Show more https://doi.org/10.1016/j.sna.2016.04.018 Highlights We tested the noise dependence of fluxgates with electroplated NiFe ring cores. The noise shows to be temperature-dependent only in few cases. The temperature dependence of the noise is not correlated with the magnetostriction. Investigation of the cooling rate of the ring after electroplating shows that thermal shock is a cause of excessive noise in the fluxgate. 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. Keywords Fluxgate; Noise; Magnetostriction; Electrodeposition; NiFe 1. Introduction Fluxgate sensors are often used to measure magnetic field at low frequency in environments where the temperature cannot be controlled. Offset stability of fluxgate has been extensively studied together with the effect of magnetostriction on it in Ref. [1]. However, the dependence of noise on temperature was measured only on amorphous [2], [3] or nanocrystalline [4] cores. We have already shown that for electrodeposited crystalline cores the minimum noise is reached for zero-magnetostriction composition [5]. In this paper we study the temperature effect using six-layer magnetic shielding with internal thermostat. Our shielding has Dewar flask to isolate temperature-controlled environment from the magnetic shielding material so it has constant temperature and the measured noise is not affected by the change of shielding remanence. We acquired noise spectra in a 0.2 Hz–200 Hz band (lower frequency could not be measured due to temperature changes in time). 2. Electrodeposition process Create account Sign in Journals & Books