论文标题
无间隙自旋波和域壁的相互作用
Interaction of gapless spin waves and a domain wall in an easy-cone ferromagnet
论文作者
论文摘要
从理论上讲，我们研究了旋转波和域壁上的域壁的相互作用。与易于轴磁体中众所周知的完美传播相比，发现域壁顶上的无间隙自旋波显示出有限的反射。基于获得的散射特性，我们研究了在Landau-Büttiker形式上受到热偏置的域壁的热磁通驱动的动力学，在那里，在其中显示出透射的木蛋白在域壁上施加镁扭矩，从而使其在域中驱动其速度线性，使其驱动粘液型，从而使速度线性向施加的热偏差驱动。轻松磁体中自旋波的独特无间隙性质也能够在低温下进行热驱动的域壁运动，这与易于轴的情况不同，在易于轴的情况下，在低温下，域壁速度被指数抑制。我们的工作表明，Easy-Cone磁铁可以用作研究无间隙波和非线性激发的相互作用的有用平台，从而实现低温镁相关的现象。
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.
