Evidence for secondary ferromagnetic phases in the nuclear magnetic resonance spectra of GaMnAs epitaxial films and their nomina effect

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Local fields in the diluted magnetic semiconductor GaMnAs were studied using zero-field nuclear magnetic resonance (NMR). After a careful search for Mn-55 and As-75 NMR signals over a wide frequency range from 20 MHz to 250 MHz, we detected a spectrum similar to alpha-MnAs. Its origins in the primary GaMnAs phase, however, cannot be fully ruled out. The temperature dependence of the NMR frequency is different from that of the material's macroscopic magnetic properties. After comparing the two, we conclude that the NMR, spectrum originates in a secondary MnAs phase. Its effect on the overall macroscopic magnetic properties appears to be minimal; we find an upper bound of similar to 0.1 % on the volume fraction of these complexes.
Publisher
KOREAN PHYSICAL SOC
Issue Date
2008-02
Language
English
Article Type
Article
Keywords

SEMICONDUCTOR; SPINTRONICS; MN)AS; (GA

Citation

JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.52, pp.396 - 401

ISSN
0374-4884
URI
http://hdl.handle.net/10203/91668
Appears in Collection
PH-Journal Papers(저널논문)
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