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High spin-wave propagation length consistent with low damping in a metallic ferromagnet



L. Flacke, L. Liensberger, Matthias Althammer, Hans Huebl, Stephan Gepr?ags, Katrin Schultheiss, Aleksandr Buzdakov, T. Hula, H. Schultheiss, Eric R. Edwards, Hans T. Nembach, Justin M. Shaw, Rudolf Gross, M. Weiler


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 26nm thick sample to be a0{less than or equal to} 3:18x10-4. Furthermore, using Brillouin light scattering microscopy, we measured spin-wave propagation lengths of up to (2161) lm in a 26nm thick Co25Fe75 heterostructure at room temperature, which is in excellent agreement with the measured damping.
Applied Physics Letters


magnetics, nanotechnology, nanomagnetics, heterostructures, ferromagnetics, Brillouin, light scattering microscopy
Created August 31, 2019, Updated June 15, 2020