论文标题
带有手性磁性域壁的几何磁化
Geometric magnonics with chiral magnetic domain walls
论文作者
论文摘要
自旋波是磁性的集体激发，是磁系统中的基本角动量载体之一。了解磁纹理中的自旋波传播在于开发纯磁信息处理方案的核心。在这里，我们表明，跨手性域壁的自旋波传播遵循简单的几何轨迹，类似于几何光学元件。在正常磁性薄膜和切向磁化膜中，几何行为在质量上不同。我们确定了跨铁磁域壁上自旋波的横向移位，折射和总反射。此外，这些几何散射现象已成为抗铁磁体中的极化，表明抗铁磁域内的自旋波双折射的出现。
Spin wave, the collective excitation of magnetic order, is one of the fundamental angular momentum carriers in magnetic systems. Understanding the spin wave propagation in magnetic textures lies in the heart of developing pure magnetic information processing schemes. Here we show that the spin wave propagation across a chiral domain wall follows simple geometric trajectories, similar to the geometric optics. And the geometric behaviors are qualitatively different in normally magnetized film and tangentially magnetized film. We identify the lateral shift, refraction, and total reflection of spin wave across a ferromagnetic domain wall. Moreover, these geometric scattering phenomena become polarization-dependent in antiferromagnets, indicating the emergence of spin wave birefringence inside antiferromagnetic domain wall.
