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MA: Fachverband Magnetismus
MA 3: Magnonics I
MA 3.5: Vortrag
Montag, 17. März 2025, 10:30–10:45, H18
Ultra-long magnon lifetime in the quantum limit — •Rostyslav O. Serha1, Kaitlin H. McAllister2, Fabian Majcen1, Sebastian Knauer1, Timmy Reimann3, Carsten Dubs3, Gennadii A. Melkov4, Alexander A. Serga5, Vasyl S. Tyberkevych6, Dmytro A. Bozhko2, and Andrii V. Chumak1 — 1University of Vienna, Vienna, Austria — 2University of Colorado, Colorado Springs, USA — 3INNOVENT e. V. technology development, Jena, Germany — 4National Taras Shevchenko University, Kyiv, Ukraine — 5RPTU, Kaiserslautern, Germany — 6Oakland University, Rochester, USA
Quantum magnonics seeks to harness the quantum mechanical properties of magnons for quantum information technologies. A major bottleneck in this field is the limited magnon lifetime, which constrains the performance of quantum magnonic systems. In this study, we investigated yttrium iron garnet (YIG) spheres with varying impurity levels using ferromagnetic resonance (FMR) spectroscopy to examine magnon lifetimes at millikelvin temperatures. For k=0 magnon modes, lifetimes of up to one microsecond were observed. Remarkably, a specialized three-magnon splitting experiment revealed lifetimes of short-wavelength dipole magnons to be up to an order of magnitude longer than their k=0 counterparts. We report a maximum magnon lifetime of 18 microseconds at a frequency of 1.6 GHz. These findings offer crucial insights into the mechanisms influencing magnon lifetimes and pave the way for quantum magnonic devices featuring long-lived propagating magnons.
Keywords: Quantum Magnonics; Lifetime; YIG