Fast ab initio methods for the calculation of adiabatic spin wave spectra in complex systems
Abstract
The interpretation of the physics of magnets with reduced dimensionality often requires information on the spin wave excitations at arbitrary wavelengths which is generally hard to obtain experimentally. Two powerful methods for the ab initio calculation of adiabatic spinwave spectra are introduced, a frozenmagnontorque method for systems with large exchange fields and a transversesusceptibility method which may be used also for materials with smaller exchange fields. The efficiency of both methods results from the fact that the number of calculations required to obtain the spinwave spectrum scales linearly with the number of basis atoms in the unit cell. Results are given for Fe, Co, Ni, permalloy Ni_{3}Fe, and CoFe, materials which are often used for thinfilm technologies.
 Publication:

Physical Review B
 Pub Date:
 March 2001
 DOI:
 10.1103/PhysRevB.63.100401
 Bibcode:
 2001PhRvB..63j0401G
 Keywords:

 75.30.Ds;
 71.15.Ap;
 71.15.Mb;
 Spin waves;
 Basis sets and related methodology;
 Density functional theory local density approximation gradient and other corrections