论文标题
通过光子马格诺耦合探测超薄范德华磁铁的自旋动力学
Probing spin dynamics of ultra-thin van der Waals magnets via photon-magnon coupling
论文作者
论文摘要
分层的范德华（VDW）磁体甚至可以保持磁性顺序，甚至可以直至单层机制，并对集成的自旋设备保持诺言。虽然对VDW磁体的磁接地态进行了广泛的研究，但旋转动力学的关键参数，例如Gilbert Damping，对于设计超快速的自旋设备至关重要，仍然在很大程度上尚未探索。尽管最近通过光激发和检测进行了研究，但使用微波实现自旋波控制是非常需要的，因为现代集成信息技术主要使用这些技术运行。然而，本质上的旋转对此构成了重大挑战。 在这里，我们提出了一种混合方法，以检测由高Q超导谐振器与Cr $ _2 $ _2 $ ge $ _2 $ _2 $ _2 $ _6 $ _6 $（CGT）之间的光子马格诺耦合介导的旋转动力学。我们用23个单独的CGT薄片测试和基准测试我们的技术，并为Gilbert阻尼参数提取上限。这些结果对于使用VDW磁铁设计片上集成电路至关重要，并为探测单层VDW磁体的自旋动力学提供了前景。
Layered van der Waals (vdW) magnets can maintain a magnetic order even down to the single-layer regime and hold promise for integrated spintronic devices. While the magnetic ground state of vdW magnets was extensively studied, key parameters of spin dynamics, like the Gilbert damping, crucial for designing ultra-fast spintronic devices, remains largely unexplored. Despite recent studies by optical excitation and detection, achieving spin wave control with microwaves is highly desirable, as modern integrated information technologies predominantly are operated with these. The intrinsically small numbers of spins, however, poses a major challenge to this. Here, we present a hybrid approach to detect spin dynamics mediated by photon-magnon coupling between high-Q superconducting resonators and ultra-thin flakes of Cr$_2$Ge$_2$Te$_6$ (CGT) as thin as 11\,nm. We test and benchmark our technique with 23 individual CGT flakes and extract an upper limit for the Gilbert damping parameter. These results are crucial in designing on-chip integrated circuits using vdW magnets and offer prospects for probing spin dynamics of monolayer vdW magnets.
