Density and T1 of surface and bulk spins in diamond in high magnetic field gradients
| Autor: | Gesa Welker, M. de Wit, Tjerk H. Oosterkamp, J. M. de Voogd |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Condensed Matter - Materials Science
Materials science Condensed matter physics Spins Condensed Matter - Mesoscale and Nanoscale Physics Relaxation (NMR) General Physics and Astronomy Diamond Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences 02 engineering and technology Dissipation engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Qubit 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Spin diffusion engineering Condensed Matter::Strongly Correlated Electrons Magnetic force microscope 010306 general physics 0210 nano-technology Spin-½ |
| Zdroj: | Physical Review Applied, 10(6), 064045 Physical Review Applied |
| Popis: | 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. Comment: 7 pages, 6 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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