3 years ago

# Density and $T_1$ of surface and bulk spins in diamond in high magnetic field gradients.

Martin de Wit, Tjerk Oosterkamp, Marc de Voogd, Gesa Welker

We report on surface and bulk spin density measurements of diamond, using ultra-sensitive magnetic force microscopy with magnetic field gradients up to 0.5 T/$\mu$m. At temperatures between 25 and 800 mK, we measure the shifts in the resonance frequency and quality factor of a cantilever with a micromagnet attached to it. A recently developed theoretical analysis allows us to extract a surface spin density of 0.072 spins/nm$^2$ and a bulk spin density of 0.4 ppm from this data. In addition, we find an increase of the $T_1$ time of the surface spins in high magnetic field gradients due to the suppression of spin diffusion. Our technique is applicable to a variety of samples other than diamond, and could be of interest for several research fields where surface, interface or impurity bulk spin densities are an important factor.

Publisher URL: http://arxiv.org/abs/1801.07535

DOI: arXiv:1801.07535v1

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