Spin-polarised radio-frequency currents, whose frequency is equal to that of the gyrotropic mode, will cause an excitation of the core of a magnetic vortex confined in a magnetic tunnel junction. When the excitation radius of the vortex core is greater than that of the junction radius, vortex core expulsion is observed, leading to a large change in resistance, as the layer enters a predominantly uniform magnetisation state. Unlike the conventional spin-torque diode effect, this highly tunable resonant effect will generate a voltage which does not decrease as a function of rf power, and has the potential to form the basis of a new generation of tunable nanoscale radio-frequency detectors.
@article{arxiv.1505.05358,
title = {Spin torque resonant vortex core expulsion for an efficient radio-frequency detection scheme},
author = {A. S. Jenkins and R. Lebrun and E. Grimaldi and S. Tsunegi and P. Bortolotti and H. Kubota and K. Yakushiji and A. Fukushima and G. de Loubens and O. Klein and S. Yuasa and V. Cros},
journal= {arXiv preprint arXiv:1505.05358},
year = {2016}
}