Magnetic resonance studies of the origin of ferromagnetism in Ga1-xMnxAs

被引:4
作者
Fedorych, OM
Wilamowski, Z
Potemski, M
Byszewski, M
Sadowski, J
机构
[1] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
[2] CNRS, MPI, Grenoble High Magnet Field Lab, F-38042 Grenoble, France
[3] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark
关键词
D O I
10.12693/APhysPolA.103.607
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Different types of magnetic resonance observed in Ga1-xMnxAs 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.
引用
收藏
页码:607 / 612
页数:6
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