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2002 | 102 | 4-5 | 617-625
Article title

Ferromagnetic, Ferrimagnetic and Spin-wave Resonances in GaMnAs Layers

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Abstracts
EN
Molecular beam epitaxy grown Ga_{1-x}Mn_xAs layers were investigated by means of magnetic resonances. With an increase in Mn concentration, x, the spectrum changes from the (i) paramagnetic one, with resolved fine and hyperfine structures, typical of S=5/2 spin of substitutional Mn^{2+} ions, for very diluted alloy, via (ii) paramagnetic spectrum, where the fine and hyperfine structures are averaged by a long range Mn^{2+}-Mn^{2+} exchange coupling, (iii) single, isotropic line of ferromagnetic resonance. Insulator to metal transition is accompanied with occurrence of (iv) a very complex spectrum of the ferrimagnetic resonance, accompanied with the well-resolved spin wave resonance. Reentrance to insulator phase for the most condensed alloys is accompanied with the reentrance to (v) ferromagnetic phase. The data confirm that the effective mass holes transfer the exchange interaction between localized Mn^{2+} spins.
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Publisher

Year
Volume
102
Issue
4-5
Pages
617-625
Physical description
Dates
published
2002-10/11
received
2002-06-07
Contributors
author
  • Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland
author
  • Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland
  • Grenoble High Magnetic Field Laboratory, MPI/CNRS, BP 166, 38042 Grenoble, France
author
  • Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland
  • Grenoble High Magnetic Field Laboratory, MPI/CNRS, BP 166, 38042 Grenoble, France
author
  • Grenoble High Magnetic Field Laboratory, MPI/CNRS, BP 166, 38042 Grenoble, France
author
  • Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv102n404kz
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