  We report the use of optically addressable spin qubits in SiC to probe the
magnetic stray fields generated by a ferromagnetic microstructure
lithographically patterned on the surface of a SiC crystal. The stray fields
cause shifts in the resonance frequency of the spin centers. The spin resonance
is driven by a micrometer-sized microwave antenna patterned adjacent to the
magnetic element. The patterning of the antenna is done to ensure that the
driving microwave fields are delivered locally and more efficiently compared to
conventional, millimeter-sized circuits. A clear difference in the resonance
frequency of the spin centers in SiC is observed at various distances to the
magnetic element, for two different magnetic states. Our results offer a
wafer-scale platform to develop hybrid magnon-quantum applications by deploying
local microwave fields and the stray field landscape at the micrometer
lengthscale.
