Strong coupling between quantized magnon modes in a YIG microstucture and microwaves in a superconducting resonator

Seth W Kurfman; Philipp Geyer; Anoop Kamalasanan; Karl Heimrich; Kwangyul Hu; Paul Tharnier; Frank Heyroth; Michael Flatté; Georg Schmidt

doi:10.48550/arxiv.2604.28145

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Strong coupling between quantized magnon modes in a YIG microstucture and microwaves in a superconducting resonator

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Strong coupling between quantized magnon modes in a YIG microstucture and microwaves in a superconducting resonator

Seth W Kurfman, Philipp Geyer, Anoop Kamalasanan, Karl Heimrich, Kwangyul Hu, Paul Tharnier, Frank Heyroth, Michael Flatté and Georg Schmidt

ArXiv.org

Cornell University

04/30/2026

DOI: 10.48550/arxiv.2604.28145

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Preprint (Author's original) This preprint has not been evaluated by subject experts through peer review. Preprints may undergo extensive changes and/or become peer-reviewed journal articles. Open Access

Abstract

Strong-coupling experiments based on magnons enable the exploration into on-chip demonstrations involving numerous long-lived excitations. Yttrium iron garnet (YIG) has been considered for decades as a gold standard material for magnonics due to its low-loss magnonic properties. While YIG has successfully demonstrated strong-coupling in macroscopic device geometries, the strong coupling of magnons in truly sub-10 micron YIG structures to date has not yet been realized. This obstacle is due to the difficulty producing large enough effective magnonic mode volume necessary primarily due to thickness limitations of YIG deposition and device fabrication techniques. Here, we demonstrate the use of a microplatelet of YIG, manufactured from a single crystal of YIG via focused ion beam (FIB) techniques, placed on a constricted inductive line of an optimized superconducting lumped element LC resonator to achieve strong coupling between numerous magnon modes and the LC resonator photons. These experimental findings are qualitatively backed by micromagnetic simulations and quantitatively supported by analytical calculations to identify the magnon modes corresponding to the experimentally observed anti-crossings in the microwave transmission signal. Further, we show that these anti-crossings remain even at incredibly low device input powers ( ≤ 10fW). The fabrication techniques and device geometry enable the deterministic use of numerous confined magnon modes in micron-scale YIG structures for various magnetic field strengths and orientations at substantially reduced device powers. The results here establish a foundational path forward to achieving efficient magnon-based strong-coupling experiments in micron-scale YIG magnetic elements for effective on-chip studies.

Physics - Materials Science

Details

Title: Subtitle: Strong coupling between quantized magnon modes in a YIG microstucture and microwaves in a superconducting resonator
Creators: Seth W Kurfman
Philipp Geyer
Anoop Kamalasanan
Karl Heimrich
Kwangyul Hu
Paul Tharnier
Frank Heyroth
Michael Flatté
Georg Schmidt
Resource Type: Preprint
Publication Details: ArXiv.org
DOI: 10.48550/arxiv.2604.28145
ISSN: 2331-8422
Publisher: Cornell University; Ithaca, New York
Language: English
Date posted: 04/30/2026
Academic Unit: Electrical and Computer Engineering; Physics and Astronomy
Record Identifier: 9985157611502771

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