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Magnetic order in semiconducting, ferromagnetic Ga1-xMnxAs

Författare:
Publiceringsår: 2004
Språk: Engelska
Sidor: S492-S493
Publikation/Tidskrift/Serie: Semiconductor Science and Technology
Volym: 19
Nummer: 4
Dokumenttyp: Artikel
Förlag: IOP Publishing Ltd.

Sammanfattning

Magnetic resonance studies allow us to distinguish paramagnetic, ferromagnetic and ferrimagnetic phases in Ga1-xMnxAs. The transition from ferromagnet to ferrimagnet is correlated with a metal to insulator transition. The analysis of spin wave resonance spectra, which occur in the ferrimagnetic phase, allows us to estimate the magnitude and the distance dependence of exchange coupling. The experimentally evaluated long range of exchange causes an effective averaging of the fluctuation of exchange interactions. As a consequence, in the semimetallic phase both spin subsystems coherently precess forming the ferrimagnetic structure. In the insulating phase, fluctuations of the local exchange field lead to a fast decoherence of the carrier spins and only the localized Mn spins form the ferromagnetic moment.

Disputation

Nyckelord

  • Physics and Astronomy

Övriga

Published
Yes
  • ISSN: 0268-1242

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