We investigate the amplification of externally excited spin waves via the Spin-Transfer-Torque (STT) effect in combination with the Spin-Hall-Effect (SHE) employing short current pulses. The results reveal that, in the case of an overcompensation of the spin wave damping, a strong nonlinear shift of the spin wave frequency spectrum occurs. In particular, this shift affects the spin wave amplification using the SHE-STT effect. In contrast, this effect allows for the realization of a spin wave switch. By determining the corresponding working point, an efficient spin wave excitation is only possible in the presence of the SHE-STT effect yielding an increased spin wave intensity of a factor of 20 compared to the absence of the SHE-STT effect.
@article{arxiv.1802.01294,
title = {Realization of a spin wave switch based on the Spin-Transfer-Torque effect},
author = {Thomas Meyer and Thomas Brächer and Frank Heussner and Alexander A. Serga and Hiroshi Naganuma and Koki Mukaiyama and Mikihiko Oogane and Yasuo Ando and Burkard Hillebrands and Philipp Pirro},
journal= {arXiv preprint arXiv:1802.01294},
year = {2018}
}