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For the generation of static magnetic fields solenoids are frequently usedfor the purpose of research and development of magnetic field sensors. Whensuch a sensor is to be analyzed with regard to its inherent noise the influenceof other noise sources of the measurement system needs to be minimized. Thisarticle reports on the low-frequency magnetic noise within such a coil system.On the one hand, the impact of the intrinsic noise of the coil itself and onthe other hand the impact of additional current noise of various commerciallyavailable current sources, which accordingly also leads to magnetic noisewithin the coil, are investigated. With low-frequency values in the range of afew tens of $\mathrm{fT}/\sqrt{\mathrm{Hz}}$, the coil's inherent noise ismostly neglectable. However, frequently utilized current sources for thegeneration of a static magnetic bias field lead to significant low-frequencymagnetic flux noise typically in the $\mathrm{nT}/\sqrt{\mathrm{Hz}}$ regime.It is found that this noise cannot be decreased by increasing the coil'smagnetic sensitivity, i.e. the magnetic flux density as a function of thestatic current. Instead, current sources with very highcurrent-to-current-noise ratios are required.

Low-Frequency Magnetic Noise in Statically-Driven Solenoid for Biasing Magnetic Field Sensors