Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 46: Spin: Transport, Orbitronics and Hall Effects I

MA 46.6: Talk

Thursday, March 19, 2020, 10:45–11:00, HSZ 403

Injection, transport, detection, and modulation of magnon spin currents in magnetic insulators — •Saül Vélez^1,3, Jialiang Gao¹, Juan Manuel Gomez-Perez², Charles-Henri Lambert¹, Luis E. Hueso², Morgan Trassin¹, Manfred Fiebig¹, Felix Casanova², and Pietro Gambardella¹ — ¹ETH Zürich — ²CIC nanoGUNE — ³saul.velez@mat.ethz.ch

Recent demonstration of efficient transport and manipulation of spin information by magnon currents has opened exciting prospects for processing information in devices. Magnon currents can be excited in magnetic insulators by applying charge currents in an adjacent metal layer. Here, by implementing a non-local device scheme, we study the magnon diffusion length (MDL) for electrically and thermally excited magnon currents in Y3Fe5O12 (YIG) and Tm3Fe5O12 (TmIG). In contrast to earlier reports, our temperature and thickness-dependence studies reveal that the MDL depends on the way the magnon currents are generated, evidencing that magnons of different energies are excited (sub-thermal and thermal for electrically- and thermally-driven magnon currents, respectively). Moreover, we demonstrate that the MDL of thermally induced magnons in YIG is the same regardless of the film thickness and growth conditions. We also evaluate the MDL of TmIG and find to be shorter (~300nm) and more susceptible to external fields than it is for YIG, which we attribute to the larger Gilbert damping of TmIG. Finally, by employing a third gate electrode, we demonstrate a current-driven spin-orbit torque modulation of the magnon conductivity in nanometre-thick TmIG films.