We study the magnetization dynamics in ferromagnet-insulator-ferromagnet and ferromagnet-insulator-normal metal ultrasmall tunnel junctions, and the associated voltage drop in the presence of an electromagnetic environment assisting the tunneling processes. We show that the environment strongly affects the resulting voltage, which becomes a highly nonlinear function of the precession cone angle $\theta$. We find that voltages comparable to the driving frequency $\omega$ can be reached even for small precession cone angles $\theta$, in stark contrast to the case where the environment is absent. Such an effect could be useful for the detection local magnetization precessions in textured ferromagnets or, conversely, for probing the environment via the magnetization dynamics.

• Received 22 July 2014
• Revised 7 October 2014

DOI:https://doi.org/10.1103/PhysRevB.90.174431