The paper describes a novel energy-harvesting system based on the Wiegand effect. The energy provided by this harvester is analysed and correlated to the required energy to start a microcontroller and perform some wireless data transfer. The energy consumption is analysed in detail down to component level. A demonstrator including an additional sensor and wireless transmitter was built, proving that sufficient energy is provided by the harvester for the wireless transfer of the sensor data.

We describe the development and characterization of a three-dimensional (3D) magnetic coil system that is able to produce magnetic flux densities of up to 2 mT in an arbitrary field direction. The coil system can be used to calibrate 3D magnetometers efficiently, and the measurements are traceable to national SI units.

Traceably calibrated scanning Hall microscopy (SHM) is a versatile tool for the quantitative characterization of magnetic microstructures. To enable SHM with a resolution in the micrometer range under ambient conditions, two Hall sensor materials, gold and graphene, were investigated. A SHM setup utilizing a 5 μm gold Hall sensor was calibrated. The field sensitivity and the detailed uncertainty budget are discussed. The presented traceable calibration is validated by comparison to simulations.

Electromagnetic coils are ubiquitously used in the modern world in motors, antennas, etc. In numerous applications, like nuclear magnetic resonance spectroscopy and imaging (known as MRI), there is a strong need for a homogeneous magnetic field. In this paper, we take advantage of an analytic method to propose a new design of MRI coils with enhanced sensitivity and homogeneity.

The High-Luminosity Large Hadron Collider (HL-LHC) project at CERN will require new superconducting magnets with strict requirements in terms of field quality. A new measurement system based on rotating coils has been developed to characterize them with high accuracy. The system measures the required quantities in a single run, which greatly reduces the necessary time and resources. Thanks to its versatility, it can be adapted to a variety of magnet sizes without major effort.