Octave-Tunable Magnetostatic Wave YIG Resonators on a Chip

Area of Science:

• Physics
• Materials Science
• Electrical Engineering

Background:

• Magnetostatic waves (MSWs) are crucial for microwave devices.
• Existing MSW devices face challenges in miniaturization and tunability.
• Yttrium iron garnet (YIG) is a promising material for MSW applications due to its low damping.

Purpose of the Study:

• To design, fabricate, and characterize novel on-chip MSW resonators.
• To develop fabrication techniques for high-performance YIG-based MSW devices.
• To demonstrate octave-band tunability and high quality factors in these resonators.

Main Methods:

• Utilized single-crystal YIG film on a GGG substrate.
• Developed a YIG film etching process for resonator patterning.
• Employed thick aluminum coplanar waveguide (CPW) inductor loops for excitation.
• Characterized resonator performance using external magnetic fields.

Main Results:

• Achieved high quality factors (Q > 3000) for MSW resonators.
• Demonstrated octave tunability (3.63 to 7.63 GHz) via in-plane magnetic fields.
• Successfully fabricated multiple single- and two-port YIG resonators on a single chip.

Conclusions:

• The developed micromachining technology enables high-performance, tunable on-chip MSW resonators.
• These YIG-based resonators show significant potential for integrated microwave applications.
• The technology offers a pathway for miniaturized and versatile microwave signal processing circuits.