Condensed Matter Physics Seminar
Element-Specific Ferromagnetic Resonance Via Time-Resolved X-Ray Magnetic Circular Dichroism
National Synchrotron Light Source
Brookhaven National Laboratory
The dynamic response of magnetic materials is of crucial importance for a variety of advanced technologies such as high speed hard disk drives and advanced communications and radar electronics. On ultrafast timescales (<1 ns), magnetization dynamics are governed by precessional motion, similar to a top precessing about its point of contact with the ground. Most of the theories of precessional motion of magnetic materials have been around in one form or another since the 1950's and 1960's and a number of the fundamental assumptions underlying those theories have remained untested. We present a new experimental technique that allows us to examine the precession of magnetic materials with element specificity. The technique allows researchers to follow the motion of elemental magnetic moments and the interactions between dissimilar moments in a ferromagnetic alloy and in multilayer systems.
Thursday, September 8, 2005
Gant Science Complex
(The seminar is followed by coffee/tea, cookies, and an informal discussions.)