Abstract (eng)
The optimization of certain processes is not only a topic in industry, economy and politics - also in magnetism and magnetic applications it is possible to optimize certain magnetic systems or the methods to simulate them. In this work, different optimization approaches in computational magnetism are presented. A new probability-based simulation technique of write and read operations in magnetic recording media leads to an immense reduction of statistical fluctuation at almost constant computational cost. Furthermore, a parameter model enables the systematic investigation of the influence of write and material parameters of magnetic grains on the resulting readout signal. It shows which possible improvements have the most significant effect on the write quality. The analytical derivation of the magnetic field of homogeneously magnetized cylindrical tiles allows precise field calculation without any numerical methods for this geometry. The formulas and their implementation also include all special cases such as cylinder sectors, cylinder rings and full cylinders. In addition, the challenges of analytical magnetic field calculations in general are also discussed. By integrating an additional magnet into a magnetic linear position sensor system, it can become stable against small misalignments in the direction of the air gap. This idea is confirmed by optimizing the spatial dimensions of the additional magnet for the desired air gap stability. To optimize arbitrary magnet shapes, the topology optimization approach can be used. We propose a hybrid optimization algorithm that combines a reasonable global and local optimizer for this approach. It overcomes the problem of local optima occurrence and finds the global optimum, which significantly improves the optimization results. Moreover, the conditions for the existence of local and global optima are discussed at the theoretical level. In all these examples, we show that the optimization approach always leads to a reduction in computational effort, an increase in accuracy, or an improvement in the magnetic system.