Efficient Excitation of High-Frequency Exchange-Dominated Spin Waves in Periodic Ferromagnetic Structures

Aryan Navabi, Cai Chen, Anthony Barra, Mohsen Yazdani, Guoqiang Yu, Mohammad Montazeri, Mohammed Aldosary, Junxue Li, Kin Wong, Qi Hu, Jing Shi, Gregory P. Carman, Abdon E. Sepulveda, Pedram Khalili Amiri, Kang L. Wang

研究成果: Article同行評審

18 引文 斯高帕斯(Scopus)

摘要

Spin waves are of great interest as an emerging solution for computing beyond the limitations of scaled transistor technology. In such applications, the frequency of the spin waves is important as it affects the overall frequency performance of the resulting devices. In conventional ferromagnetic thin films, the magnetization dynamics in ferromagnetic resonance and spin waves are limited by the saturation magnetization of the ferromagnetic (FM) material and the external bias field. High-frequency applications would require high external magnetic fields which limit the practicality in a realistic device. One solution is to couple microwave excitations to perpendicular standing spin waves (PSSWs) which can enable higher oscillation frequencies. However, efficient coupling to these modes remains a challenge since it requires an excitation that is nonuniform across the FM material thickness and current methods have proven to be inefficient, resulting in weak excitations. Here, we show that by creating periodic undulations in a 100-nm-thick Co40Fe40B20 layer, high-frequency PSSWs (>20 GHz) can be efficiently excited using micrometer-sized transducers at bias fields below 100 Oe which absorb nearly 10% of the input rf power. Efficient excitation of such spin waves at low fields may enable high-frequency spintronic applications using exchange-dominated magnetic oscillations using very low external magnetic fields and, with design optimizations, can bring about alternative possibilities in the field.

原文English
文章編號034027
期刊Physical Review Applied
7
發行號3
DOIs
出版狀態Published - 2017 3月 28

All Science Journal Classification (ASJC) codes

  • 物理與天文學 (全部)

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