Spin waves and their quanta magnons are collective excitation of electron spins in magnetic materials which can serve as information carriers for future low-power-consumption computing systems. Ferrimagnetic thin-film iron garnets are considered as an ideal platform for spin waves due to the low Gilbert damping. Here, we review the recent progress of magnonics based on thin-film iron garnets, including the yttrium iron garnet (YIG). Short-wavelength spin waves with dispersion relation governed by the exchange interaction have recently been reported in low damping YIG thin films. Periodical nanostructure thin-film iron garnets enrich the functionalities of magnonic crystals. In addition, pure spin currents in adjacent heavy metal layers could induce magnetic auto-oscillations and propagating spin waves in thin-film iron garnets. The broken inversion symmetry has also been found in thin-film iron garnets probed by chiral spin-wave group velocities. We conclude that thin-film iron garnets hold a bright future for magnon based logic devices and circuits.

中文翻译：

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基于薄膜铁石榴石的磁铁

自旋波及其量子磁振子是磁性材料中电子自旋的集体激发，可以作为未来低功耗计算系统的信息载体。由于吉尔伯特阻尼低，铁磁性薄膜铁石榴石被认为是自旋波的理想平台。在这里，我们回顾了基于薄膜铁石榴石（包括钇铁石榴石（YIG））的强磁技术的最新进展。近来在低阻尼YIG薄膜中已经报道了具有由交换相互作用控制的色散关系的短波长自旋波。周期性的纳米结构薄膜铁石榴石丰富了镁铁晶体的功能。此外，相邻重金属层中的纯自旋电流会在薄膜铁石榴石中引起磁自激振荡并传播自旋波。在通过手性自旋波群速度探测的薄膜铁石榴石中也发现了破碎的反转对称性。我们得出结论，薄膜铁石榴石在基于磁振子的逻辑器件和电路中有着广阔的前景。