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(Color online) (a) Schematic showing the experimental geometry of the sample with respect to the He* beam and applied magnetic field. (b) and (c) Metastable deexcitation spectra for a clean and oxygen-exposed Ho thin film, respectively.
(Color online) (a) Asymmetry as a function of sample bias for a 20 ML Ho film at 25 K in a magnetic field of 5 T. (b) Asymmetry as a function of applied field for the same film as in (a) at a sample bias of 11 V and two different temperatures.
(Color online) Temperature dependence of the sample current asymmetry for 5, 10, and 20 ML Ho films in a magnetic field of 5 T and with a sample bias of 11 V.
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