Probing spin dynamics of ultra-thin van der Waals magnets via photon-magnon coupling.
Probing spin dynamics of ultra-thin van der Waals magnets via photon-magnon coupling.
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DOI：
10.1038/s41467-023-38322-x
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发表时间：
2023-05-05
影响因子：
16.6
通讯作者：
Kurebayashi, Hidekazu
中科院分区：
文献类型：
--
作者：
Zollitsch, Christoph W.;Khan, Safe;Nam, Vu Thanh Trung;Verzhbitskiy, Ivan A.;Sagkovits, Dimitrios;O'Sullivan, James;Kennedy, Oscar W.;Strungaru, Mara;Santos, Elton J. G.;Morton, John J. L.;Eda, Goki;Kurebayashi, Hidekazu
层状货车德瓦耳斯（vdW）磁体可以保持磁秩序，甚至下降到单层制度，并持有集成自旋电子器件的希望。虽然vdW磁体的磁基态被广泛研究，但自旋动力学的关键参数，如吉尔伯特阻尼，对于设计超快自旋电子器件至关重要，仍然在很大程度上未被探索。尽管最近的研究通过光学激发和检测，实现自旋波控制与微波是非常可取的，因为现代集成信息技术主要是用这些操作。然而，本质上少量的自旋对这一点构成了重大挑战。在这里，我们提出了一种混合的方法来检测自旋动力学介导的高Q超导谐振器和超薄片的Cr2 Ge 2 Te 6（CGT）薄至11 nm之间的光子-磁振子耦合。我们用23个单独的CGT薄片测试和基准测试我们的技术，并提取吉尔伯特阻尼参数的上限。这些结果是至关重要的，在设计芯片上集成电路使用VDW磁体和探测单层VDW磁体的自旋动力学提供了前景。货车德瓦耳斯磁性材料在二维原子层中保持磁性，在基于自旋的信息处理方面具有巨大的技术潜力，然而，与三维材料相比，测量其自旋动力学的典型方法通常受到单个原子层中自旋数量少的阻碍。在这里，Zollitsch等人提出了一种方法，用于检测自旋动力学的货车范德华磁体通过它和超导谐振器之间的光子-磁振子耦合，与潜在的解决自旋动力学下降到一个单一的单层。
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 Cr2Ge2Te6 (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. van der Waals magnetic materials, which retain magnetism down to a single two-dimensional layer of atoms, have great technological potential for spin-based information processing, however, typical approaches to measure their spin dynamics are often hampered by the small number of spins in a single atomic layer compared to three dimensional materials. Here, Zollitsch et al present a methodology for the detection of spin dynamics in van der Waals magnets via photon-magnon coupling between it and a superconducting resonator, with potential to resolve spin dynamics down to a single monolayer.
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