标题： 观察和控制BiYIG薄膜中的手性自旋挫折 显示英文标题

标题： Observation and Control of Chiral Spin Frustration in BiYIG Thin Films

摘要： 磁性层内的手性相互作用稳定了非共线自旋结构的形成，这些结构可以被用来设计具有定制磁化动力学的器件。 在这里，我们引入了手性自旋挫败，其中能量简并的磁态挫败了Dzyaloshinskii-Moriya相互作用。 我们展示了在铋取代的钇铁石榴石薄膜中，由磁振子驱动的手性挫败自旋态的切换。 这些状态由一个面内宏自旋定义，该宏自旋两侧各有两个方向相反的手性出平面自旋。 通过扫描氮空位磁力计和自旋泵浦，我们识别出了四个简并的挫败状态，并通过磁振子自旋扭矩实现了它们的可控切换。 关键的是，切换是单向的，选择性由入射磁振子的方向决定。 这种机制提供了一种强大的方法，利用磁振子操控挫败的自旋态。 手性自旋挫败解除了传统挫败的几何约束，因此为挫败磁学开辟了新的前景，为基于挫败的节能自旋电子器件铺平了道路。 显示英文摘要

摘要： Chiral interactions within magnetic layers stabilize the formation of noncollinear spin textures, which can be leveraged to design devices with tailored magnetization dynamics. Here, we introduce chiral spin frustration in which energetically degenerate magnetic states frustrate the Dzyaloshinskii-Moriya interaction. We demonstrate magnon-driven switching of the chirally frustrated spin states in Bi-substituted yttrium iron garnet thin films. These states are defined by an in-plane macrospin neighboring two out-ofplane spins on either side with opposing chirality. Using scanning nitrogen-vacancy magnetometry and spin pumping, we identified four degenerate frustrated states and achieved their controllable switching via magnon spin torque. Crucially, the switching is unidirectional, with selectivity determined by the incoming magnon direction. This mechanism provides a powerful approach to manipulate frustrated spin states with magnons. Chiral spin frustration unlocks the geometry constraints of conventional frustration, and therefore opens new horizons for frustrated magnetism, paving the way for energy-efficient spintronic devices based on frustratio