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- W2068571903 abstract "Our recent studies of the influence of hydrogenation on the ferromag netic semiconductor Gal-xMnxAs are reviewed. We find that upon exposure to a remote DC hydrogen plasma, the hole density p in Ga1-xMnxAs thin films with x = 0.037 and x = 0.051 can be reduced by several orders of magnitude, while the density of Mn magnetic moments is not significantly affected by the plasma treatment. The ferromagnetism clearly present in the as-grown samples vanishes after hydrogen incorporation. We analyze the effect of the hydrogenation in de tail with the help of secondary ion mass spectroscopy, electronic transport, Hall, DC magnetization, and Fourier-transform infra-red absorption experiments. All re sults indicate that the Mn acceptors are electrically passivated by the formation of Mn-As-H complexes, resulting in the loss of long-range magnetic ordering. Dilute magnetic semiconductors (DMS) are a very interesting class of materi als, because they bring together the long-range magnetic order characteristic of ferromagnets and the versatile properties of semiconductors. Therefore, DMS are considered as an important building block for semiconductor-based magneto-electronic devices. Moreover, exploiting the well-established tech niques of semiconductor technology to manipulate the semiconductor prop erties of DMS often also allows to control the magnetic ordering. Several such approaches have been demonstrated in different DMS, including the use of photo-generated charge carriers (1), the field effect (2), annealing (3), and co-doping (4). Gal-xMnxAs, on which we focus here, is currently the prototype III-V dilute magnetic semiconductor. For Mn contents x ~ 0.01, Ga1_xMnxAs becomes ferromagnetic, with Curie temperatures Te :S 170 K (5,6). The introduction of Mn into GaAs simultaneously gives rise to (i) large local ized magnetic moments and (ii) delocalized holes. The former are caused by the electrons in the half-filled 3d5-shell of Mn, which couple to a high-spin" @default.
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- W2068571903 date "2006-02-07" @default.
- W2068571903 modified "2023-09-23" @default.
- W2068571903 title "Hydrogen and Magnetism in Ga1-xMnxAs" @default.
- W2068571903 cites W2221327774 @default.
- W2068571903 doi "https://doi.org/10.1002/chin.200606232" @default.
- W2068571903 hasPublicationYear "2006" @default.
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