DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2006 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

MA: Magnetismus

MA 36: Magnetic Coupling Phenomena / Exchange-Bias

MA 36.7: Talk

Friday, March 31, 2006, 12:15–12:30, HSZ 401

Temperature dependent effects of interlayer exchange coupling in rare earth trilayers — •M. Wietstruk, K.M. Döbrich, J.E. Prieto, O. Krupin, F. Heigl, G. Kaindl, and K. Starke — Freie Universität Berlin, Fachbereich Physik

We investigated the thickness and temperature dependence of the interlayer exchange coupling (IEC) in Tb/Y/Gd-Trilayers. Using wedge samples with Y-spacer layer thicknesses between 5 and 35Å, we recorded hysteresis loops by x-ray magneto-optical Kerr effect (XMOKE) at the Gd M5 edge. By scanning along the wedge, we could measure about 1.5 oscillation periods of the coupling strength on each sample.

In this all-rare-earth-metal system, we find that the phase of the oscillatory coupling shifts with temperature. In particular, for a fixed spacer layer thickness of 15Å, the coupling changes reversibly between ferromagnetic and antiferromagnetic, when changing the temperature between 20K and 120K.

We compare the experimental findings with simple model calculations in the quantum-well-state picture with free-electron reflectivities. Additionally, we present QWS calculations for this system using theoretical valence band dispersions of bulk Tb, Y, and Gd.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2006 > Dresden