Mr. Nicolas Thiery Profile

Nicolas Thiery

at CEA-Grenoble

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Proceedings Article | 10 September 2019 Presentation

Origin of the transresistance signals in YIG/Pt devices (Conference Presentation)

Nicolas Thiery, Vladimir Naletov, Laurent Vila, Grégoire de Loubens, Michel Viret, Nathan Beaulieu, Jamal Ben Youssef, Vladislav Demidov, Sergej Demokritov, Vincent Cros, Olivier Klein

Proceedings Volume 11090, 1109043 (2019) https://doi.org/10.1117/12.2529148

KEYWORDS: Magnons, Magnetism, Spintronics, Ferromagnetics, Metals, Electrons, Dielectrics, Data processing, Yttrium, Iron

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Generation and detection of pure spin currents circulating in magnetic insulator materials have proven its worth by enabling transport of spin information across large distances, much further than in metals, thanks to the abscence of decay mechanism through the delocalized electrons. Spin currents here propagate over localized magnetic moments via spin-waves (SW), or their quanta the magnons, with characteristic frequencies ranging from GHz to THz and associated wavelengths from μm to nm. Most of the work so far has focus on Yttrium Iron garnets (YIG), which is a ferrimagnetic insulator with the lowest known amount of magnetic damping. In this talk, I will present recent result of spin waves transport in high quality ultra-thin films exploiting spin-orbit tools to interconvert the spin signal into an electrical signal. By injecting a high current density in Pt electrodes deposited few microns apart on top of a YIG film, a pure magnon current propagating in the YIG can be induced/detected via the direct/inverse spin Hall effect. In this work, I will mainly focus on investigating the behavior at large energies. We have found that the magnon tranresistance in this system can cross several regimes that involve strong change in the magnon distribution. Throughout various techniques such as Brillouin light scattering spectroscopy, spin Seebeck and spin Hall magnetoresistance measurements, we provide a complete analysis of the different phenomena surrounding the spin transport in thin YIG films and we will show that our experimental findings do not support yet the emergence of new collective behaviors, such as Bose-Einstein condensation at room temperature.

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