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The phenomenology of magnetic damping is of critical importance for devicesthat seek to exploit the electronic spin degree of freedom since dampingstrongly affects the energy required and speed at which a device can operate.However, theory has struggled to quantitatively predict the damping, even incommon ferromagnetic materials. This presents a challenge for a broad range ofapplications in spintronics and spin-orbitronics that depend on materials andstructures with ultra-low damping. Such systems enable many experimentalinvestigations that further our theoretical understanding of numerous magneticphenomena such as damping and spin-transport mediated by chirality and theRashba effect. Despite this requirement, it is believed that achievingultra-low damping in metallic ferromagnets is limited due to the scattering ofmagnons by the conduction electrons. However, we report on a binary alloy of Coand Fe that overcomes this obstacle and exhibits a damping parameterapproaching 0.0001, which is comparable to values reported only forferrimagnetic insulators. We explain this phenomenon by a unique feature of thebandstructure in this system: The density of states exhibits a sharp minimum atthe Fermi level at the same alloy concentration at which the minimum in themagnetic damping is found. This discovery provides both a significantfundamental understanding of damping mechanisms as well as a test oftheoretical predictions.

Ultra-low magnetic damping of a metallic ferromagnet