We analyze the low-energy physics of nearly ferromagnetic metals in two spatial dimensions using the functional renormalization group technique. We find a new low-energy fixed point, at which the fermionic (electronlike) excitations are non-Fermi-liquid ($z_f=13/10$) and the magnetic fluctuations exhibit an anomalous Landau damping whose rate vanishes as ${\mathrm{\Gamma }}_{\mathbf{q}}\sim |\mathbf{q}{|}^{3/5}$ in the low-$|\mathbf{q}|$ limit. We discuss this renormalization of the Landau-damping exponent, which is the major novel prediction of our work, and highlight the possible link between that renormalization and neutron-scattering data on ${\mathrm{UGe}}_2$ and related compounds. Implications of our analysis for ${\mathrm{YFe}}_2{\mathrm{Al}}_{10}$ are also discussed.

• Received 30 October 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.226404