Speaker: Prof. Dr. Stefan Eisebitt, Institut für Optik und Atomare Physik, Technische Universität Berlin, Germany.

Date: 2010-11-26

Time: 14:15 - 15:15

Place: Physics Department, Lecture Hall B, Sölvegatan, Lund, Sweden.

Abstract: Our most advanced x-ray sources – modern 3rd generation synchrotrons and Free Electron Lasers – provide a coherent photon flux that allows performing interference experiments with x-rays. I will present an overview on how x-ray holography can be used to record high resolution images in general and will focus on examples in the area of nanomagnetism, where we study the structure-function relationship in prototypes for bit patterned magnetic data storage media.

The fundamental timescale for ultrafast optical manipulation of the magnetization is the femto- and picosecond second regime. On these timescales, energy and angular momentum are transferred between the electrons, spins and the lattice, but the details of the mechanism of ultrafast optical demagnetization are under debate. As Free Electron X-ray Lasers provide intense x-ray pulses with sub-100 femtosecond duration, they open a route for the study of ultrafast magnetic phenomena with simultaneous nanometer spatial resolution. I will present results from recent IR-pump X-probe experiments in the area of femtomagnetism performed at FLASH, Hamburg, and LCLS, Stanford.

Contact person, ESS seminars:
Marie-Louise Ainalem
E-mail: marie-louise.ainalem[at]esss.se