5. Analysis

The experiment we conduct is based on the premise that monopoles traversing the pickup coil of a SQUID will thread flux Φ_∗ through it, proportional to their charge ± m _∗. Instead of step function jumps in the SQUID signal (Fig. 2.​7), a magnetic noise Φ(t) (Fig. 2.​8) is expected to be detected by the highly sensitive flux noise spectrometer developed for this experiment. This noise originates from a thermally stimulated dense plasma of monopoles that get generated and may recombine in the temperature range 1.2K ≤ T ≤ 4K. In this chapter, the experimental results of Spin Noise Spectroscopy of Dysprosium Titanate are presented and analyzed. These results are then compared to the predictions made by the analytic formulation of generation recombination noise as well as Monte Carlo simulations of spin noise coming from a Dy₂Ti₂O₇ sample.