Mapping the stray fields of a nanomagnet using spin qubits in SiC

TL;DR

This paper demonstrates using optically addressable spin qubits in SiC to map magnetic stray fields from a ferromagnetic microstructure, enabling local microwave control and potential hybrid magnon-quantum applications.

Contribution

It introduces a method to probe magnetic stray fields in SiC with high spatial resolution using patterned microwave antennas and spin qubits.

Findings

Resonance frequency shifts observed at different distances from the magnetic element.

Local microwave delivery enhances control over spin resonance.

Platform suitable for hybrid magnon-quantum device development.

Abstract

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.