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The electrical resistivity of several relatively clean metallic ferromagnets,as well as the helimagnet MnSi, is commonly observed to exhibitnon-Fermi-liquid behavior at low temperatures. This behavior, which is found inboth ordered and disordered phases, and both near and away from the magnetictransition, remains a major unsolved problem. We derive and discuss three novelmechanisms underlying such behavior that are based on electron scatteringmediated by the exchange of (1) ferromagnons or (2) skyrmionic fluctuations,both in conjunction with weak disorder, or (3) helimagnons in clean systems.Since the magnetic transition in weakly disordered sytems is genericallydiscontinuous, static droplets of the ordered phase can exist within thedisordered phase, making the mechanisms viable there as well. We compare ourtheoretical results with existing experimental ones and suggest additionalexperiments.

Generic non-Fermi-liquid behavior of the resistivity in magnets with ferromagnetic, helical, or skyrmionic order