Compact tunable YIG-based RF resonators

Abstract

We report on the design, fabrication, and characterization of compact tunable yttrium iron garnet (YIG)-based RF resonators based on μm-sized spin-wave cavities. Inductive antennas with both ladder and meander configurations were used as transducers between spin waves and RF signals. The excitation of ferromagnetic resonance and standing spin waves in the YIG cavities led to sharp resonances with quality factors up to 350. The observed spectra were in excellent agreement with a model based on the spin-wave dispersion relations in YIG, showing a high magnetic field tunability of about 29 MHz/mT.

Lumped circuit model for inductive antenna spin-wave transducers

“…As a more concrete structure, we now consider a straight wire antenna with rectangular cross section at a distance s above a magnetic thin film, as used in various spin-wave propagation experiments 14 , 18 , 23 – 32 . The structure and the geometry of the studied structure are depicted in Fig.…”

“…Historically, FMR has found applications in microwave resonators, oscillators, and filters based on Yttrium iron garnet (YIG) 4 , 5 . In recent years, much research has been devoted to miniaturizing spin-wave and FMR-based devices and structures in the growing field of (nano-)magnonics, with potential applications in spintronic computation 6 – 15 and scaled microwave analog systems 16 – 18 .…”

“…For such devices, distributed models of have been formulated that describe quantitatively the change in microwave impedance of the microstrip due to the excitation of FMR or spin waves 3 . Recently, micro- and nanomagnonic devices have however frequently used wire or U-shaped inductive antennas connected to coplanar waveguides since such structures can be more easily miniaturized 14 , 18 , 23 – 32 . For such antennas, the microwave behavior is better described by a lumped impedance of the inductive antenna and represented by an equivalent circuit.…”

Chip-Based Brillouin Processing for Microwave Photonic Phased Array Antennas

“…However, many parallel filters are required to enable operation over a wide frequency range, increasing both system complexity and size. Filters based on ferromagnetic and ferrimagnetic materials, including yttrium iron garnet (YIG), achieve wide frequency tunability using compact cavities [15], [16], but require an external magnetic field to control their resonant frequency, complicating integration. While the abovementioned devices exhibit impressive performance, there is no clear RF filter technology that can operate over a wide frequency range and be implemented in a compact footprint that is compatible with element-level processing for high frequency PAAs [1].…”

Strain Control of Magnetic Anisotropy in Yttrium Iron Garnet Films in a Composite Structure with Yttrium Aluminum Garnet Substrate

“…Bismuth-substituted YIG and several RIGs show high Faraday rotation and are useful for applications such as magnetic field sensors [4][5][6]. YIG is one of the materials with the lowest losses at high frequencies and is used in microwave devices including resonators, filters, and RF sensors [7][8][9][10][11]. Spin waves in nano-structures of YIG, referred to as YIG magnonics, are of interest for information storage and processing technologies [7].…”