Ferromagnetic, Ferrimagnetic and Spin-wave Resonances in GaMnAs Layers

• Authors: O. Fedorych , M. Byszewski , Z. Wilamowski , M. Potemski , J. Sadowski
• Languages of publication: EN

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.

Keywords

EN

71.55.Eq; 76.30.Fc; 75.50.Pp; 75.30.Gw

Discipline

• 75.30.Gw: Magnetic anisotropy
• 76.30.Fc: Iron group (3d) ions and impurities (Ti-Cu)
• 71.55.Eq: III-V semiconductors
• 75.50.Pp: Magnetic semiconductors

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2002
• Volume: 102
• Issue: 4-5
• Pages: 617-625

Dates

published

2002-10/11

received

2002-06-07

Contributors

author

O. Fedorych

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

author

M. Byszewski

• 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

Z. Wilamowski

• 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

M. Potemski

• Grenoble High Magnetic Field Laboratory, MPI/CNRS, BP 166, 38042 Grenoble, France

author

J. Sadowski

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

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Identifiers

DOI

10.12693/APhysPolA.102.617