Magnetic Resonance Studies of the Origin of Ferromagnetism in Ga_{1-x}Mn_xAs

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

Abstracts

EN

Different types of magnetic resonance observed in Ga_{1-x}Mn_xAs reflect three different magnetic phases: para-, ferro-, and ferrimagnetic. Ferromagnet is characterized by single isotropic resonance line. A complex spectrum in ferrimagnet can be described by g factor equal to 1.44 and a sum of an axial and cubic anisotropy field. The axial field is by an order of magnitude greater than the cubic one. The complex structure of ferrimagnetic resonance is attributed to spin-wave resonance. Quantitative analysis of the dispersion of spin wave shows that the range of exchange coupling is very long, of the order of 25 nm, while spin-wave stiffness and the total exchange field are very small. The exchange field as evaluated from spin wave is by two orders of magnitude smaller than the Zener field corresponding to the critical temperature.

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: 2003
• Volume: 103
• Issue: 6
• Pages: 607-612

Dates

published

2003-06

received

2003-05-30

Contributors

author

O. Fedorych

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

author

Z. Wilamowski

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

author

M. Potemski

• Grenoble High Magnetic Field Laboratory, MPI/CNRS, 380-42 Grenoble, France

author

M. Byszewski

• Grenoble High Magnetic Field Laboratory, MPI/CNRS, 380-42 Grenoble, France

author

J. Sadowski

• Niels Bohr Institute, Copenhagen University, 2100 Copenhagen, Denmark
• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

References

• 1. H. Ohno, J. Magn. Magn. Mater., 200, 110, 1999
• 2. T. Dietl, H. Ohno, F. Matsukura, J. Cibert, D. Ferrand, Science, 287, 1019, 2000
• 3. For a review see T. Dietl, Semicond. Sci. Technol., 17, 377, 2002
• 4. O. Fedorych, E. Hankiewicz, Z. Wilamowski, J. Sadowski, Phys. Rev. B, 66, 045201, 2002
• 5. J. Szczytko, A. Twardowski, K. Świątek, M. Palczewska, M. Tanaka, T. Hayashi, K. Ando, Phys. Rev. B, 60, 8304, 1999
• 6. H. Hasegawa, Prog. Theor. Phys., 21, 483, 1959
• 7. S.E. Barnes, Adv. Phys., 30, 801, 1981
• 8. M. Farle, Rep. Prog. Phys., 61, 755, 1998
• 9. S. Foner, in: Magnetism, Eds. G.T. Rado, H. Shul, Academic Press, New York 1963, p. 381
• 10. A.G. Gurevich, in: Magnetic Oscillations and Waves, Science, Moskva 1994, p. 464
• 11. C. Kittel, Phys. Rev., 110, 4, 1958
• 12. M. Sawicki, F. Matsukura, A. Idziaszek, T. Dietl, G. Shott, C. Ruester, G. Karczewski, G. Schmidt, L. Molenkamp, cond-mat/0212511, submitted to Phys. Rev. B
• 13. X. Liu, Y. Sasaki, J.K. Furdyna, Phys. Rev. B, 67, 205204, 2003
• 14. S.T.B. Goennenwein, T. Graf, T. Waaner, M.S. Brandt, M. Stutzmann, Appl. Phys. Lett., 82, 5, 2003
• 15. Mark Rubinstein, A. Hanbicki, P. Lubitz, M. Osofsky, J.J. Krebs, B. Jonker, J. Magn. Magn. Mater., 250, 164, 2002
• 16. O. Fedorych, M. Byszewski, Z. Wilamowski, M. Potemski, J. Sadowski, Acta Phys. Pol. A, 102, 617, 2002
• 17. O. Fedorych, M. Byszewski, Z. Wilamowski, M. Potemski, J. Sadowski, J. Supercond., 16, 1, 2003

Identifiers

DOI

10.12693/APhysPolA.103.607