Abstract
Spin-wave excitations (magnons) of AF-III zinc-blende MnTe were modeled with a Heisenberg Hamiltonian, including isotropic exchanges and magnetic anisotropy, and compared to experimental results determined previously. The calculated dispersions depend on the assumption made on the spin arrangement of the structure, which leads to exclude the Keffer-canted structure. From the fit of theoretical curves to experimental data the dominant exchange constants were determined, pointing out the importance of distant neighbors. The effects of the anisotropy and of the tetragonal structural distortion on the spin-wave spectrum allowed a discussion on their contribution and evidenced the need for a more specific anisotropic-exchange term. The value of the nearest-neighbor exchange interaction in pure MnTe determined by this way was compared with the interpolation of data taken for diluted magnetic systems.
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