Thermal noise magnetometry as an emerging magnetic characterization technique

This contribution gives an overview of recent advances in thermal noise magnetometry (TNM), an emerging method for the characterization of magnetic nanoparticles. This method is unique as it does not rely on measuring the response to an external field excitation. Instead it passively measures the fluctuations in the magnetization of the particle ensemble in thermal equilibrium. Through theoretical and experimental advances, we show how TNM can now be applied to a variety of applications in a practical and accessible manner. Specifically, we show how TNM can be used to study aggregation processes in biological media.