Monday, October 6, 2008, 10:00 am — NSLS-II Seminar Room, Bldg. 817
We present the combination of two powerful spectroscopic techniques, time-resolved x-ray magnetic circular dichroism (tr-XMCD) and ferromagnetic resonance (FMR), which produces a new and powerful tool for examining the dynamics of heterogeneous magnetic materials. With this technique, the dynamic response of individual layers or precession of individual elements in an alloy can be detected. Extremely accurate measurements of the precession cone angle (to 0.2°) and the phase of oscillation (to 2°, or ~5 ps at 2.3 GHz) are achieved. With this precision, and the ability to detect the dynamics of individual elements, fundamental assumptions in phenomenological theories such as the Landau-Lifschitz-Gilbert formalism can be investigated. The combination of tr-XMCD and FMR can be used to study the origins of intrinsic precession damping by measuring the relative phase lag of dissimilar and precessing spins. We will discuss measurement of the dynamic response of specific elements and separate layers in several alloys and multilayer structures. Recent advances in the measurement of the element-resolved complex susceptibility and prospects for future advances will also be presented.
Hosted by: Qun Shen
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