Reconfigurable control of coherence, dissipation, and nonreciprocity in cavity magnonics.

Jintao Shuai, Bojong Kim, Junyoung Kim, Rutvij Bhavsar, Sang-Koog Kim

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Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

Authors and funding

5 authors.

Jintao ShuaiNational Creative Research Initiative Center for Spin Dynamics and Spin-Wave Devices, Nanospinics Laboratory, Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea.

Bojong KimNational Creative Research Initiative Center for Spin Dynamics and Spin-Wave Devices, Nanospinics Laboratory, Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea.

Junyoung KimNational Creative Research Initiative Center for Spin Dynamics and Spin-Wave Devices, Nanospinics Laboratory, Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea.

Rutvij BhavsarSchool of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea.

Sang-Koog KimNational Creative Research Initiative Center for Spin Dynamics and Spin-Wave Devices, Nanospinics Laboratory, Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea. sangkoog@snu.ac.kr.

Funding

National Research Foundation of Korea No. RS-2024-00347921

6 · The paper itself

Abstract

Precise control of coupling strength, damping rate and nonreciprocity in photon-magnon systems is essential for advancing hybrid quantum technologies, including reconfigurable microwave components and quantum transducers. Here, we demonstrate magnetic field angle-dependent control of photon-magnon coupling and magnon dissipation in a cross-shaped microwave cavity supporting a spatially nonuniform radio-frequency (rf) magnetic field. By rotating the external magnetic field angle θ relative to the normal of the transmission line within the cavity plane, we simultaneously control the coherent coupling strength [Formula: see text], the ferromagnetic resonance (FMR) damping rate, and the system's nonreciprocal response. The nonuniform rf field selectively excites both the uniform FMR mode and finite-wavevector spin waves in an Yttrium Iron Garnet (YIG) film, enabling angle-dependent two-magnon scattering. While typically regarded as a passive loss mechanism, we show that two-magnon scattering can serve as a dynamic and reversible knob to control magnon damping. Moreover, we realise nonreciprocity originating from the spatial asymmetry of the rf field, in addition to conventional phase-based schemes. These findings introduce new opportunities for in situ control of coherence, dissipation, and nonreciprocity in cavity magnonics, with broad implications for reconfigurable quantum and spintronic systems.

Identifiers

PMID40847106

DOI10.1038/s41598-025-15983-w

PMCPMC12373738

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.