Magnetization dynamics in the YIG/Au/YIG magnon valve

Abstract

The magnetization dynamics of an yttrium iron garnet (YIG)/Au/YIG magnon valve was investigated using broadband ferromagnetic resonance. The material characterizations of YIG/Au/YIG were performed using cross-sectional scanning transmission electron microscopy, x-ray diffraction spectroscopy, x-ray photoemission spectroscopy, Raman spectroscopy, and UV–visible spectroscopy. Asymmetric Fano resonance in the YIG/Au (60 nm)/YIG magnon valve structure was observed experimentally, and the two coupled oscillators model was used to describe the source of the Fano resonance qualitatively. We also provide a quantitative description of the Fano resonance and extract the Fano factor, which is an important feature that can be used to define the interaction sign. This represents the first attempt to apply the Fano resonance to magnetization dynamics. The spin wave resonance modes excited by the Au nanoparticles (NPs) surface plasmons were also observed in a YIG/Au NPs/YIG structure. Our findings confirm the occurrence of magnetic Fano resonance in the YIG/Au/YIG magnon valve and pave the way toward the development of quantum information devices based on magnon valves.

Tuning of Magnetic Damping in Y3Fe5O12/Metal Bilayers for Spin-Wave Conduit Termination

“…Interestingly, fracturing of the YIG film is more severe for the Au layer than for Ir or Pt layers of similar thickness. This can be attributed to the early stages of Au shrinking towards the formation of Au nanoparticles or nanorods during the 5 min thermal annealing step [46,47]. This interpretation is congruent with the island-like pattern seen in the SEM images, corresponding to a defect correlation length of 800 nm.…”

Dynamic electromagnonic crystals based on ferrite-ferroelectric thin film multilayers

“…Information can be transferred in diverse magnetic materials, including insulators, in the form of a spin wave [1][2][3]. Investigations of a wide variety of linear [4][5][6] and nonlinear [7][8][9] spin-wave phenomena address the field of science known as magnonics. The promising building blocks for magnonic devices are constituted by artificial spatially periodic magnetic media, known as magnonic crystals [10][11][12][13][14][15][16][17].…”