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Proceedings Paper

Origin of the transresistance signals in YIG/Pt devices (Conference Presentation)
Author(s): Nicolas Thiery; Vladimir Naletov; Laurent Vila; Grégoire de Loubens; Michel Viret; Nathan Beaulieu; Jamal Ben Youssef; Vladislav Demidov; Sergej Demokritov; Vincent Cros; Olivier Klein

Paper Abstract

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.

Paper Details

Date Published: 10 September 2019
Proc. SPIE 11090, Spintronics XII, 1109043 (10 September 2019); doi: 10.1117/12.2529148
Show Author Affiliations
Nicolas Thiery, CEA-Grenoble (France)
Vladimir Naletov, Kazan Federal Univ. (Russian Federation)
Laurent Vila, CEA-Grenoble (France)
Grégoire de Loubens, CEA-Paris-Saclay (France)
Michel Viret, CEA-Paris-Saclay (France)
Nathan Beaulieu, Lab. des Sciences et Techniques de l'Information, de la Communication et de la Connaissance (France)
Jamal Ben Youssef, Lab. des Sciences et Techniques de l'Information, de la Communication et de la Connaissance (France)
Vladislav Demidov, Westfälische Wilhelms-Univ. Münster (Germany)
Sergej Demokritov, Westfälische Wilhelms-Univ. Münster (Germany)
Vincent Cros, Unité Mixte de Physique CNRS/Thales (France)
Olivier Klein, CEA-Grenoble (France)

Published in SPIE Proceedings Vol. 11090:
Spintronics XII
Henri-Jean M. Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi, Editor(s)

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