Hamburg 2001 – wissenschaftliches Programm

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SYDU: Dynamik von Ummagnetisierungsvorgängen

SYDU VI: HV VI

SYDU VI.1: Hauptvortrag

Donnerstag, 29. März 2001, 12:15–12:45, S5.2

Spin-polarized photoelectron emission microscopy with femtosecond temporal resolution — •Hermann A. Dürr — Institut für Festkörperforschung,Forschungszentrum Jülich, 52425 Jülich

The increasing miniaturization in non-volatile data-storage devices demands substantial shortening of read-write cycles. In order to study the underlying physical phenomena and fundamental limits it is necessary to probe the spin-dynamics in nanostructures on a fsec time-scale. We present an approach where this can be achieved together with the required nm spatial resolution. The method is based on the combination of fsec pump-probe laser-techniques and photoelectron emission microscopy. Magnetic sensitivity is obtained by analyzing the spin-polatization of the photoelectrons emitted by the probe laser pulse. This allows us direct access to the time evolution of the valence-band magnetization following a pump laser pulse. We will discuss the scope of the technique for several examples.