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Electric field control of interaction between magnons and quantum spin defects

The nanoscale magnetic field of magnons has emerged as a promising resource for coherently driving qubits such as quantum spin defects (QSD) and developing versatile probes for magnetism and other types of quantum matter. Tuning this coupling via electric field would provide a path to address the outstanding challenges of enhancing QSD-based sensing of electric fields and locally manipulating QSD qubits with minimal power. Here, we demonstrate a new approach to such electric field tuning using a ferromagnet-ferroelectric hybrid multiferroic film integrated with nitrogen-vacancy (NV) center spins. Combining NV-spin relaxometry with ferromagnetic resonance measurements, we reveal that the ferroelectric polarization controls the magnetic anisotropy, which tunes the magnon-generated fields at the NVs. Flipping the ferroelectric polarization changes NV-spin relaxation rate by 400%, which could be further enhanced by three orders of magnitude by nanopatterning the ferromagnets. Our results offer possibilities of realizing improved NV-sensing of electric fields, electric-field-tunable quantum spintronic devices, and magnon/spin probes of the multiferroic order and quantum materials.