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2003 | 103 | 6 | 607-612
Article title

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

Content
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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
Publisher

Year
Volume
103
Issue
6
Pages
607-612
Physical description
Dates
published
2003-06
received
2003-05-30
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
author
  • Grenoble High Magnetic Field Laboratory, MPI/CNRS, 380-42 Grenoble, France
author
  • Grenoble High Magnetic Field Laboratory, MPI/CNRS, 380-42 Grenoble, France
author
  • Niels Bohr Institute, Copenhagen University, 2100 Copenhagen, Denmark
  • 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-appv103n613kz
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