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MA: Fachverband Magnetismus

MA 3: Magnetic Materials I

MA 3.3: Talk

Monday, March 26, 2007, 10:45–11:00, H22

Non-adiabatic spin dynamics in thin magnetic films — •Pawel Buczek, Arthur Ernst, Leonid Sandratskii, and Patrick Bruno — Max Planck Institute of Microstructure Physics

The thermal properties of magnetic materials are essentially influenced by the spectrum of spin fluctuations (magnons and Stoner excitations), both in bulk materials and in the systems with reduced dimensionality, e.g. films.

For small wave-length excitations, it is crucial to treat both the magnons and Stoner excitations dynamically, on an equal footing, especially in systems with reduced dimensionality. The most reliable way to consider magnon properties is by the computation of frequency-dependent magnetic susceptibility.

In our project the ground state of a magnetic film is generated by means of layered KKR Green's function method. Subsequently, the magnetic susceptibility is constructed in a two-step procedure. First, an auto-convolution of the KKR Green's function (non-enhanced susceptibility) is constructed. In the next step, true susceptibility is obtained through a solution of a selfconsistent integral equation, originating from the time dependent DFT. Layered KKR has the advantage of yielding realistic band structure; also the relaxations of the film crystalline structure in the direction perpendicular to its surface can be taken into account.

In the presentation the fundamentals of the method will be discussed along with several preliminary results on magnetic excitations in bulk Fe and its thin films.