Interaction of gapless spin waves and a domain wall in an easy-cone ferromagnet

Abstract

We theoretically study the interaction of spin waves and a domain wall in a quasi-one-dimensional easy-cone ferromagnet. The gapless spin waves on top of a domain wall are found to exhibit finite reflection in contrast to the well-known perfect transmission of gapful spin waves in easy-axis magnets. Based on the obtained scattering properties, we study the thermal-magnon-driven dynamics of a domain wall subjected to a thermal bias within the Landau-Büttiker formalism, where transmitted magnons are shown to exert the magnonic torque on the domain wall and thereby drive it with the velocity linear to the applied thermal bias. The peculiar gapless nature of spin waves in easy-cone magnets enables the thermally-driven domain-wall motion even at low temperatures, differing from the easy-axis case where the domain-wall velocity is exponentially suppressed at low temperatures. Our work suggests that easy-cone magnets can serve as a useful platform to study the interaction of gapless spin waves and nonlinear excitations and thereby realize low-temperature magnon-related phenomena.

6 pages, 3 figures

References in corpus (6)

• Magnon-skyrmion scattering in chiral magnets
• Propulsion of a domain wall in an antiferromagnet by magnons
• Spin wave assisted current induced magnetic domain wall motion
• Domain wall heat conductance in ferromagnetic wires
• Interaction Between a Domain Wall and Spin Supercurrent in Easy-cone Magnets
• Atomic-Scale Spin-Wave Polarizer Based on a Sharp Antiferromagnetic Domain Wall