We report ultralow intrinsic magnetic damping in Co25Fe75 heterostructures, reaching the low 10−4 regime at room temperature. By using a broadband ferromagnetic resonance technique in out-of-plane geometry, we extracted the dynamic magnetic properties of several Co25Fe75-based heterostructures with varying ferromagnetic layer thicknesses. By measuring radiative damping and spin pumping effects, we found the intrinsic damping of a 26 nm thick sample to be . Furthermore, using Brillouin light scattering microscopy, we measured spin-wave propagation lengths of up to (21 ± 1) μm in a 26 nm thick Co25Fe75 heterostructure at room temperature, which is in excellent agreement with the measured damping.
High spin-wave propagation length consistent with low damping in a metallic ferromagnet
Luis Flacke, Lukas Liensberger, Matthias Althammer, Hans Huebl, Stephan Geprägs, Katrin Schultheiss, Aleksandr Buzdakov, Tobias Hula, Helmut Schultheiss, Eric R. J. Edwards, Hans T. Nembach, Justin M. Shaw, Rudolf Gross, Mathias Weiler; High spin-wave propagation length consistent with low damping in a metallic ferromagnet. Appl. Phys. Lett. 16 September 2019; 115 (12): 122402. https://doi.org/10.1063/1.5102132
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