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Researchers at Argonne National Laboratory and the University of Illinois Urbana-Champaign have demonstrated a hybrid circuit in which propagating magnetic spin waves in an epitaxial yttrium iron garnet (YIG) film couple strongly to microwave photons in a superconducting resonator fabricated directly on the film. In the Damon–Eshbach geometry, the hybrid mode radiates nonreciprocally, giving the signal a preferred direction. The result is a materials and device proof of concept for future on-chip microwave isolation and hybrid quantum hardware—not a finished isolator or a quantum computer.
What the experiment demonstrated
The device joins two normally separate ways of carrying information. A spin wave is a collective excitation of aligned magnetic moments in a ferrimagnet; its quantum counterpart is a magnon. A superconducting resonator stores and processes microwave electromagnetic energy, whose quantum counterpart is a photon. In the reported circuit, a spin wave traveling through YIG interacts with the resonator’s microwave field, allowing energy and information to move from the magnetic medium into the superconducting circuit.
The resonator was patterned on an epitaxial YIG thin film. This direct fabrication places the microwave field where it can overlap propagating spin-wave modes instead of coupling only to a single, spatially confined magnetic resonance. Yi Li, the Argonne scientist who led the work, described it as “the first time we’ve shown the proof of concept, demonstrating that we can couple spin waves to a superconducting resonator.”
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How spin waves couple to the superconducting circuit
- Generate a propagating magnetic excitation. A microwave drive excites a spin-wave mode in the YIG film. The wave carries angular momentum and energy along the film rather than remaining at one point.
- Overlap the wave with the resonator field. The superconducting resonator is fabricated on top of the film, so its oscillating microwave magnetic field intersects the moving magnetization.
- Exchange energy coherently. When the spin-wave and resonator frequencies are suitably matched, the two modes hybridize. Energy oscillates between the magnetic excitation and the microwave photon mode before losses erase the coherence.
- Read out a microwave signal. The resonator converts the magnetic excitation into a signal in the superconducting circuit, providing an electrical route for information that began as a traveling spin wave.
The study found strong coupling for both major propagating configurations used in the device: Damon–Eshbach and backward-volume modes. In this context, strong coupling means the coherent interaction rate exceeds the damping rates of the magnon and photon modes. The exchange is therefore faster than the relevant losses, which is the condition needed to observe a genuine hybrid mode rather than a barely detectable perturbation.
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What “one-way street” means in this device
Spin-wave propagation is not always reciprocal. With the appropriate magnetization direction, wavevector and static magnetic field, a Damon–Eshbach mode can have different radiation behavior in opposite directions. The researchers observed nonreciprocal spin-wave radiation from the hybrid magnonic mode: coupling is favored for one propagation direction and suppressed for the reverse direction.
That directionality is the physical basis of the “one-way street” description. A circuit receiving information from the magnetic wave can be less exposed to unwanted reflections or return signals traveling back toward the source. Yi Li summarized the engineering motivation: “One-way propagation is important because it can help guide information in a single direction and reduce unwanted return signals.”
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This is not the same as a completed commercial microwave isolator. The result shows that a nonreciprocal magnetic mode can be strongly coupled to a superconducting resonator. Turning that behavior into a specified isolation component would require additional device engineering, characterization and system-level testing.
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YIG is attractive for magnonic and quantum devices because it can support low-loss magnetic excitations. The problem is that many established YIG growth platforms use substrates containing rare-earth ions. At cryogenic temperatures, those ions can absorb microwave energy, adding loss to the resonator and obscuring the coherent magnon–photon interaction.
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The team instead grew the epitaxial YIG film on a rare-earth-free Y3Sc2Ga3O12 substrate, then fabricated the superconducting resonator on that film. This removed the known absorption pathway while preserving a suitable magnetic platform. Li said, “Nobody had succeeded in doing so before because of the materials challenge. Now we’ve shown that this platform works.”
The substrate choice is more than a manufacturing detail: cryogenic compatibility, magnetic damping and microwave loss must all be acceptable at the same time. A material combination that works at room temperature can fail once the device is cooled to the operating conditions of superconducting circuits.
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The two propagating modes and what was established
| Mode | Propagation configuration | Result in the reported device | Why it matters |
|---|---|---|---|
| Damon–Eshbach | Magnetization and propagation arranged for a surface-like mode | Strong coupling and nonreciprocal spin-wave radiation were observed | Provides the direction-dependent behavior relevant to future isolation |
| Backward-volume | Propagation aligned with the magnetization direction | Strong coupling to the superconducting resonator was observed | Shows that the platform couples to more than one propagating spin-wave family |
The accessible publication summaries do not give a single headline coupling rate, operating temperature or isolation ratio. Those values should not be inferred from the strong-coupling claim; they require the complete experimental report and its measurement conditions.
Why this matters for quantum-information hardware
Superconducting circuits are widely used to control microwave quantum states, while magnonics supplies magnetic excitations that can travel through a chip and can exhibit intrinsic nonreciprocity. Combining them could eventually provide compact routing, buffering or isolation functions inside a cryogenic quantum system, where reducing reflections and protecting sensitive modes are important.
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Valentine Novosad, the Argonne corresponding author, described the broader idea this way: “This work is one example where we use magnetic excitations, which are spin waves in magnetic materials patterned in a chip, and make them communicate with a different kind of electromagnetic wave that lives in a superconducting resonator.” The result connects propagating-spin-wave magnonics, cavity magnonics and superconducting-circuit engineering in one device architecture.
It does not demonstrate a quantum processor, quantum logic operation, error correction or a complete information-processing system. The immediate achievement is an enabling interface: a reproducible material stack and resonator geometry in which propagating magnetic modes and microwave photons interact coherently.
What comes next
Future versions can be judged on several concrete engineering measures:
- Directionality: how strongly forward and reverse transmission differ under the chosen field and geometry.
- Loss and damping: whether magnetic and microwave linewidths remain low after integration and cooling.
- Coupling margin: how far the interaction rate exceeds both mode-damping rates.
- Cryogenic materials compatibility: whether substrates, interfaces and superconducting films avoid added absorption.
- Integration density: how many resonators, waveguides and magnetic sections can fit on a useful chip.
- System function: whether a later device demonstrates isolation, routing or another information-processing task rather than coupling alone.
Those tests will determine whether the proof of concept can become a practical component. Axel Hoffmann, a University of Illinois corresponding author, framed the motivation as a search across material systems for properties that can support new technologies. Novosad called the area “a new field, an emerging field” that is attracting worldwide attention.
Publication and chronology
The peer-reviewed report, “Strong Coupling between Propagating Spin Waves and Microwave Photons in a Superconducting Resonator,” by Yi Li and colleagues, appeared in Physical Review Letters 137, 116706, on 10 September 2026 (DOI: 10.1103/8t91-w9nn). Its arXiv preprint was submitted on 25 June 2026. The institutional announcement from Argonne and the University of Illinois Urbana-Champaign presents the work as the first demonstration of coupling propagating spin waves to a superconducting resonator.
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