Controlling the radiative damping of an on-chip artificial magnon mode

Controlling magnetic damping lies at the heart of spintronic applications. In particular, manipulating the radiative damping of magnons is important for the emerging dissipative magnon-photon coupling and, therefore, opens up possibilities for advanced hybrid magnonic devices, nonreciprocal transmission, and topological information processing. The materials or structures that produce magnon modes can be further enriched with an artificial magnon mode produced in a complementary electric inductive-capacitive (CELC) resonator due to its flexible tunability, miniaturized size, and easy integration. Here, we explore the radiative linewidth broadening and frequency shifts of a CELC resonator in an on-chip coplanar waveguide in a self-interfering configuration. The radiative dynamics depends on the magnetic component of the local density of photon states, as well as the intensity, polarization, and boundary conditions. In particular, a voltage-controlled phase shifter was integrated to demonstrate voltage-controlled radiative damping. Adopting both the CELC resonator and its complementary structure may be an effective tool for obtaining the spatial distribution of the electric and magnetic components of microwaves. Our work is a general approach to manipulating the radiative damping of magnetic resonance, which has the potential for on-chip functional devices based on dissipative magnon-photon interactions.