Abstract (eng)
Whether for safety aims in the automotive sector, for electronical devices used daily or for industrial purposes, magnetic field sensing plays a crucial role in our everyday life. In all these application fields, a high sensing accuracy is of major importance. To sense the strength of magnetic fields, the simple Hall sensor exploiting the Hall effect is the most widely used sensor type. This is mostly due to its simplicity, both in the theoretical description and in the practical application, and due to its high accuracy. However, the Hall sensor based on the typical Hall effect with the Lorentz force controlling it is not always applicable, especially for the measurement of small magnetic fields. Fortunately, there are many different Hall effects with more complicated physical backgrounds. A very promising approach is to take the spins of electrons into account. Spintronics has a large variety of potential applications and the Spin Hall effect might help in the improvement of magnetic field sensors. This effect is one of the main contributors to the recently described Spin Orbit Torque (SOT) effect. Another interesting application of a sensor in a magnetic field is the multiturn counter. The aim of this device is to count the number of rotations of a magnetic field without the help of current enabling the field sensing at any time. Hence, the sensor is initialized and afterwards, no power supply is necessary for counting. When determining the final number of rotations, power must be supplied for readout.