Detection of spin pumping from YIG by spin-charge conversion in a Au-Ni80Fe20 spin-valve structure.pdf (3.82 MB)
Detection of spin pumping from YIG by spin-charge conversion in a spin-valve structure
journal contributionposted on 2018-11-26, 15:02 authored by N. Vlietstra, B.J. van Wees, Fasil DejeneFasil Dejene
Many experiments have shown the detection of spin-currents driven by radio-frequency spin pumping from yttrium iron garnet (YIG), by making use of the inverse spin-Hall effect, which is present in materials with strong spin-orbit coupling, such as Pt. Here we show that it is also possible to directly detect the resonance-driven spin-current using Au|permalloy (Py, Ni80Fe20) devices, where Py is used as a detector for the spins pumped across the YIG|Au interface. This detection mechanism is equivalent to the spin-current detection in metallic non-local spin-valve devices. By finite element modeling we compare the pumped spin-current from a reference Pt strip with the detected signals from the Au|Py devices. We find that for one series of Au|Py devices the calculated spin pumping signals mostly match the measurements, within 20%, whereas for a second series of devices additional signals are present which are up to a factor 10 higher than the calculated signals from spin pumping. We also identify contributions from thermoelectric effects caused by the resonant (spin-related) and non-resonant heating of the YIG. Thermocouples are used to investigate the presence of these thermal effects and to quantify the magnitude of the Spin-(dependent-)Seebeck effect. Several additional features are observed, which are also discussed.
This work is supported by NanoNextNL, a micro and nanotechnology consortium of the Government of the Netherlands and 130 partners, by NanoLab NL and by the Zernike Institute for Advanced Materials (Dieptestrategie program).
Published inPhysical Review B
CitationVLIETSTRA, N., VAN WEES, B.J. and DEJENE, F.K., 2016. Detection of spin pumping from YIG by spin-charge conversion in a spin-valve structure. Physical Review B, 94: 035407.
Publisher© American Physical Society
- AM (Accepted Manuscript)
Publisher statementThis work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/
NotesThis paper was accepted for publication in the journal Physical Review B and the definitive published version is available at https://doi.org/10.1103/PhysRevB.94.035407