钇铁石榴石自旋波导管中磁钉扎对自旋波模的影响(英文)

Effect of Magnetization Pinning on Spin Wave Modes in Spin Wave Conduit of Yttrium Iron Garnet

利用微磁模拟,研究钇铁石榴石自旋波导管边界的磁钉扎对其中自旋波动力学的影响。模拟结果表明:磁钉扎引起的双磁子散射将自旋波散射到多个方向,使得自旋波在k空间的分布更加分散。自旋波模的演化表明:不同自旋波模的共振场不同,而双磁子散射使得自旋波模的共振场更为接近。另外,双磁子散射通过改变自旋波模的弛豫速率,改变了自旋波模的共振强度,幅度可达40%。增大自旋波导能够降低磁钉扎的影响,可以用来提升自旋波导的性能。

The effect of magnetization pinning at corners on spin wave dynamics in a spin wave conduit of yttrium iron garnet is investigated by using micromagnetic simulation.The simulation results reveal that two⁃magnon scattering brought on by this magnetization pinning scatters spin waves in various directions,resulting in a more dispersed spin wave pattern in k space.The evolution patterns of spin waves suggest that spin waves modes resonate at different applied magnetic fields,and magnetization pinning⁃induced magnon scattering brings the resonance fields of spin wave modes closer together.In addition,this magnon scattering modifies the intensity of spin wave modes at resonance,by more than 40 percent,for example,though altering their relaxation rate.By lengthening spin wave conduits the effects of this magnetization pinning could be limited,which may improve the performance of spin wave conduits.