The spin-pumping mechanism is probed through a tunnelling MgO interlayer in Fe/Pt bilayers. We show by ferromagnetic resonance technique and spin-pumping experiments that spin currents can tunnel through the MgO interlayer for thickness up to 2~{nm} and can produce significant voltages in the Pt layer. The electrical detection of spin-pumping furthermore reveals the critical role of rectification and shunting effects on the generated voltages. The non zero spin current transport through a few monolayers of an insulating interlayer might initiate further studies on the role of very thin oxides in spin-pumping experiments.
@article{arxiv.1702.05298,
title = {Spin-pumping through a varying-thickness MgO interlayer in Fe/Pt system},
author = {Laura Mihalceanu and Sascha Keller and Jochen Greser and Dimitrios Karfaridis and Konstantinos Symeonidis and Georgios Vourlias and Thomas Kehagias and Andres Conca and Burkard Hillebrands and Evangelos Th. Papaioannou},
journal= {arXiv preprint arXiv:1702.05298},
year = {2017}
}