凝聚态物理
自旋波
磁学
物理
磁化
克尔效应
磁畴
磁各向异性
磁场
铁磁性
材料科学
自旋极化
自旋霍尔效应
量子力学
电子
非线性系统
作者
Weijia Zhu,Huajun Qin,Lukáš Flajšman,Tomoyasu Taniyama,Sebastiaan van Dijken
摘要
We report zero-field routing of spin waves in a multiferroic heterostructure comprising a ferromagnetic Fe film and a ferroelectric BaTiO3 substrate with fully correlated strain-coupled domains. In the Fe film, a regular alternation of magnetic anisotropy produces a back-and-forth rotation of uniform magnetization in zero magnetic field. Spin waves propagating across this domain structure are refracted at the magnetic domain walls because of abrupt changes in the dispersion relation and phase velocity. Using super-Nyquist sampling magneto-optical Kerr effect microscopy, we image the routing of spin waves and analyze the dependence of the effect on frequency and the propagation direction. We find that spin waves are routed efficiently by angles up to 60° without measurable loss in amplitude. The experimental results are reproduced by micromagnetic simulations and calculations based on the modified Snell's law for magnonics.
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