Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 42: Posters Magnetism I

MA 42.7: Poster

Wednesday, March 18, 2020, 15:00–18:00, P3

First electrical detection of a magnon BEC in bulk-YIG — •Timo B. Noack, Vitaliy I. Vasyuchka, Burkard Hillebrands, and Alexander A. Serga — Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany

Magnons are weakly ineracting bosonic quasi-particles and therefore they are able to form a Bose-Einstein condensate even at room temperatures. The comparable easy technique of generation of the BEC in magnonic systems, the possibility of its creation at ambient conditions and its potential for the application of this macroscopic quantum state in post-Von-Neumann computing make this research field to a large growing part of the modern magnonics. In this contribution we demonstrate the first measurements of magnon BECs in bulk-sample. A clear threshold of the applied pumping power for the condensation of magnons at the lowest energy state was found. The direct electrical measurement of this lowest state reveals the expected narrow frequency bandwidth and confirmes, thus, the population of a single quantum state. Coincidentally with the sudden narrowing at this treshold a drastic increase in the decay time of the signal can be observed. Financial support of the European Research Council within the Advanced Grant 694709 SuperMagnonics "Supercurrents of MagnonCondensates for Advanced Magnonics" is gratefully acknowledged.