Abstract
Magnonics is an emerging field dealing with ultralow power consumption logic circuits, in which the flow of spin waves, rather than electric charges, transmits and processes information. Waves, including spin waves, excel at encoding information via their phase using interference. This enables a number of inputs to be processed in one device, which offers the promise of multi-input multi-output logic gates. To realize such an integrated device, it is essential to demonstrate spin wave interferometers using spatially isotropic spin waves with high operational stability. However, spin wave reflection at the waveguide edge has previously limited the stability of interfering waves, precluding the use of isotropic spin waves, i.e., forward volume waves. Here, a spin wave absorber is demonstrated comprising a yttrium iron garnet waveguide partially covered by gold. This device is shown experimentally to be a robust spin wave interferometer using the forward volume mode, with a large ON/OFF isolation value of 13.7 dB even in magnetic fields over 30 Oe.
Highlights
Without Au, the discrimination between ON and OFF levels was only 0.85 mV, whereas the Au/YIG device showed ON and OFF levels well separated by 4.14 mV, which exceeded the standard deviation of the output signal. These results indicate that a spin wave (SW) interferometer with an edge absorber comprising an Au/YIG structure ensured a robust and reliable operation over a magnetic field range of tens of Oe, a significant advance towards the practical implementation of FV SW logic devices
We experimentally demonstrated a FV SW phase interferometer based on a low damping YIG waveguide
The SW propagation and interference in the waveguide was analyzed with a finite slab model and three dimensional finite element method (FEM) calculations, which enabled the device geometry to be designed
Summary
In the presence of the Au absorber, the difference between the amplitude distributions was small (Fig. 5e,f), due to the suppression of reflected SWs. FV SW Interference.
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