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Nitrogen vacancy (NV) color centers in diamond form promising magnetic sensors due to stable photoluminescence (PL), optically readable spins and high coherence times even at ambient conditions. Either individual centers or ensembles of NV centers can be used; the first offering ultimate resolution down to the nanoscale [1]; the latter offering enhanced sensitivity and a gain in PL signal [2].
We have employed Auger electron spectroscopy (AES), high resolution electron energy loss spectroscopy (EELS), low energy electron diffraction (LEED) and scanning tunneling microscopy (STM) to investigate the growth of an Al 2 O 3 film on CoAl(100). While exposure to oxygen at room temperature leads to the formation of amorphous alumina, subsequent annealing at higher temperatures results...
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