Hybrid magnonic systems have recently attracted wide attentions due to due to rich potential applications in coherent information processing. One particularly interesting platform is the thin-film-based magnon-magnon hybrid system, which has been recently explored in magnetic bilayers [1-4]. Because magnon excitations are confined within the magnetic media, it is convenient to build up more compact hybrid platforms in micron scale compared with millimeter-scale microwave circuits. Furthermore, the abundant spintronic properties, such as spin-torque manipulation and spin pumping, can be used to control and engineer the hybrid dynamics especially for magnetic thin-film devices. In this work, we demonstrate electrical detection of strongly coupled magnon-magnon hybrid system in yttrium iron garnet/permalloy (YIG/Py) bilayer devices. Direct microwave current injection through the conductive Py layer drives the hybrid dynamics consisting of the uniform mode of Py and the first standing spin wave (n=1) mode of YIG, which are strongly coupled via interfacial exchange coupling. The hybrid dynamics is detected via the spin rectification signal from Py, which provides phase resolution of the coupled dynamics. For the Py-dominated mode we measure a constant phase evolution. For the YIG-dominated mode a π phase shift is measured across the avoided crossing, which agrees with theoretical prediction. In addition, the characterization of nonlocal devices consisting two Py devices on a YIG base device shows that the two Py devices are coupled by inductive coupling, allowing spin rectification measurements of the nonlocal Py device. Our results provide a new device platform for exploring hybrid magnonic dynamics and probing their phases, which are crucial for implementing coherent information processing with magnon excitations. Sample preparation and measurements were supported by the US Department of Energy, Basic Energy Sciences, Materials Science and Engineering Division. Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.References: [1] S. Klingler, et al., Phys. Rev. Lett. 120, 127201 (2018). [2] J. Chen, et al., Phys. Rev. Lett. 120, 217202 (2018). [3] H. Qin, et al., Sci. Rep. 8, 5755 (2018). [4] Y. Li, et al., Phys. Rev. Lett. 124, 117202 (2020)

Phase-resolved electrical detection of strongly coupled magnon-magnon hybrid device

M3: Magnetization Dynamics and Damping IV: Spin current, spin-torque, Spin Transport, Vortices, Skyrmions and Domain Walls

technical paper

The 65th Annual Conference on Magnetism and Magnetic Materials (MMM 2020) was held in a virtual form. The COVID-19 pandemic, with its associated uncertainty about international travel and the ability to gather in large groups, meant that the Steering Committee decided to cancel the face-to-face meeting that had been planned in Palm Beach, Florida November 2-6, 2020.

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Yi Li

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Phase-resolved electrical detection of strongly coupled magnon-magnon hybrid device