An electronic noise study of temperature and current-induced magnetization dynamics*

We investigate the magnetization-induced noise dynamics from microscopic thermal fluctuations and applied currents in a magnetic thin film using electronic noise measurements, complemented by magnetic imaging. We detect distinct fluctuation characteristics of the electronic noise signal resulting from the current-induced magnetic domain nucleation and propagation in addition to the thermally-induced domain-wall oscillatory behavior in different frequency domains. Both these dynamics indicate a dependence on the magnetic configuration. Our investigation of all magnetic configurations created in the magnetic thin film including magnetic multidomains and skyrmions gives us a complete electronic noise description of the microscopic and fluctuating magnetization dynamics.