Tunnel barrier enhanced voltage signals generated by magnetization precession of a single ferromagnetic layer

摘要

We report the electrical detection of magnetization dynamics in anAl/AlOx/Ni80Fe20/Cu tunnel junction, where a Ni80Fe20 ferromagnetic layer isbrought into precession under the ferromagnetic resonance (FMR) conditions. Thedc voltage generated across the junction by the precessing ferromagnet isenhanced about an order of magnitude compared to the voltage signal observedwhen the contacts in this type of multilayered structure are ohmic. We discussthe relation of this phenomenon to magnetic spin pumping and speculate on otherpossible underlying mechanisms responsible for the enhanced electrical signal.