Physics – Condensed Matter – Materials Science
Scientific paper
2010-06-07
Phys. Rev. B 82, 085204 (2010)
Physics
Condensed Matter
Materials Science
17 pages, 12 figures (added Eq. 36, replaced Fig. 10)
Scientific paper
10.1103/PhysRevB.82.085204
The collective behavior of spins in a dilute magnetic semiconductor is determined by their mutual interactions and influenced by the underlying crystal structure. Hence, we begin with the atomic quantum-mechanical description of this system using the proposed variational-perturbation calculus, and then turn to the emerging macroscopic picture employing phenomenological constants. Within this framework we study spin waves and exchange stiffness in the p-d Zener model of (Ga,Mn)As, its thin layers and bulk crystals described by the spds* tight-binding approximation. Analyzing the anisotropic part of exchange, we find that the Dzyaloshinskii-Moriya interaction may lead to the cycloidal spin arrangement and uniaxial in-plane anisotropy in thin layers, resulting in a surface-like anisotropy in thicker films. We also derive and discuss the spin-wave contribution to magnetization and Curie temperature. Our theory reconstructs the values of stiffness determined from the temperature dependence of magnetization, but reproduces only partly those obtained from analyzing precession modes in (Ga,Mn)As thin films.
Dietl Tomasz
Werpachowska Agnieszka
No associations
LandOfFree
Theory of spin waves in ferromagnetic (Ga,Mn)As does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Theory of spin waves in ferromagnetic (Ga,Mn)As, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Theory of spin waves in ferromagnetic (Ga,Mn)As will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-367219