利用受激涡旋旋转实现偶极耦合磁盘间的可调谐能量传递
Tunable energy transfer between dipolar-coupled magnetic disks by stimulated vortex gyration
摘要：
自然界中存在着各种各样的耦合谐振子。不同振荡器之间的耦合允许它们之间的相互能量转移2 -4和信息信号传播5，6的可能性。低能量输入信号及其低能量耗散传输是信息处理设备设计中的关键技术因素7。在这里，利用耦合振荡器的概念，我们实验证明了一个强大的新机制，空间分离的偶极耦合磁盘之间的能量转移-受激涡旋回转。通过时间分辨软X射线显微镜获得了直接的实验证据。由偶极相互作用引起的两个简正模的频率分裂，导出了能量从一个圆盘到另一个圆盘的转移率。这种机制提供了可调的能量传递速率，低功率输入信号，和低能量耗散的磁性元件与可忽略的阻尼的优点。耦合涡态盘是在室温以上工作的信息信号处理装置的有希望的候选者。
英文摘要：
A wide variety of coupled harmonic oscillators exist in nature1. Coupling between different oscillators allows for the possibility of mutual energy transfer between them2-4 and the information-signal propagation5,6. Low-energy input signals and their transport with low-energy dissipation are the key technical factors in the design of information processing devices7. Here, utilizing the concept of coupled oscillators, we experimentally demonstrated a robust new mechanism for energy transfer between spatially separated dipolar-coupled magnetic disks - stimulated vortex gyration. Direct experimental evidence was obtained by time-resolved soft X-ray microscopy. The rate of energy transfer from one disk to the other was deduced from the two normal modes' frequency splitting caused by dipolar interaction. This mechanism provides the advantages of tunable energy transfer rate, low-power input signal, and low-energy dissipation for magnetic elements with negligible damping. Coupled vortex-state disks are promising candidates for information-signal processing devices that operate above room temperature.
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