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The surface spin waves in the multiband model

✍ Scribed by R. Świrkowicz; K. Świderczak

Publisher
Elsevier Science
Year
1986
Weight
362 KB
Volume
141
Category
Article
ISSN
0378-4363

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✦ Synopsis

The transverse dynamic susceptibility in thin films of ferromagnetic transition metals is calculated within the framework of the approach used by Lowde and Windsor for bulk crystals. Numerical calculations are carried out using the band structure determined in a self-consistent way according to the LCAO method. The changes of the effective Coulomb integral and of the atomic potential in the surface layers are taken into account. For wave vectors small as compared to the reciprocal lattice vector the well-defined surface spin waves with energies lower than energies of bulk modes are obtained. For greater values of the wave vector the spin wave modes are rather strongly damped.

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Spin waves in the 2D Hubbard model beyon
Spin waves in the 2D Hubbard model beyond the RPA
✍ P.J.H. Denteneer; J.M.J. van Leeuwen 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 157 KB

The spin-wave velocity c for the repulsive Hubbard model on a square lattice at half-filling is calculated as the square root of spin stiffness over perpendicular susceptibility using the variational Monte Carlo method with Gutzwiller wave function. For 3 < U/t < 12, c increases by 34--15% compared