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Title: Detection of spin pumping from YIG by spin-charge conversion in a spin-valve structure
Authors: Vlietstra, N.
van Wees, B.J.
Dejene, F.K.
Issue Date: 2016
Publisher: © American Physical Society
Citation: VLIETSTRA, 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.
Abstract: 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.
Description: This 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
Sponsor: 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).
Version: Accepted for publication
DOI: 10.1103/PhysRevB.94.035407
URI: https://dspace.lboro.ac.uk/2134/36223
Publisher Link: https://doi.org/10.1103/PhysRevB.94.035407
ISSN: 2469-9950
Appears in Collections:Published Articles (Physics)

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