Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 43: Magnetization Dynamics III

MA 43.6: Vortrag

Donnerstag, 3. April 2014, 16:15–16:30, HSZ 401

Standing spin waves in thin magnetic films: A method to test for layer-dependent exchange coupling — •Jayaraman Rajeswari, Harald Ibach, and Claus M. Schneider — Peter Grünberg Institut, Forschungszentrum Jülich, 52425 Jülich, Germany

We present an experimental method for probing the layer dependence of exchange coupling constants in thin magnetic films. The method is based on the simultaneous observation of standing spin waves with a single node inside the film and surface spin waves of the film using the technique of inelastic electron scattering. Experimental data are shown for 5-8 layers of fcc cobalt deposited on Cu(100). The data are compared to theoretical studies predicting a strong enhancement of the exchange coupling constants at the surface and the interface and even oscillations near surface and interface. Neither one fits the experimental data per se, while a simple nearest neighbor Heisenberg model with uniform exchange coupling does. We therefore conclude a small depth dependence of the exchange coupling between atoms.