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A growing interest in the investigation and control of spin systems at the nanoscale level has emerged in recent years, spurred by advancements in the manipulation and harnessing of the spin degree of freedom, and by the potential to impact the fields of quantum information processing, sensing, and energy efficiency. Particularly intriguing is the possibility of combining different spin-based materials and devices to take advantage of their unique characteristics within a hybrid architecture. Here, we explore the interplay between ferromagnetic systems and spin qubits in diamond nanoparticles, both to investigate the viability of spin wave/qubit control and to advance the understanding of fundamental spintronics effects. In particular, we investigate a regime in which surface spin waves excited in a ferromagnetic layer coherently interact with the qubits, allowing for their efficient and uniform control over a spatial range of hundreds of microns.² The results have important implications for engineering strongly coupled hybrid quantum spin systems, as well as for the fields of nanoscale magnetic and thermal sensing.

¹In collaboration with M. Fukami, C. F. de las Casas, J. Li, X. Liu, H. L. Bretscher, J. R. Berman, P. F. Nealey, F. J. Heremans, and D. D. Awschalom
² P. Andrich, C. F. de las Casas, X. Liu, H. L. Bretscher, J. R. Berman, F. J. Heremans, P. F. Nealey, and D. D. Awschalom, npj Quan. Infor. 3, 28 (2017).