ELFT HÍRADÓ

[Nagy Denes Lajos <nagy AT rmki.kfki.hu>]

                            M E G H Í V Ó

a KFKI RMKI és a KFKI CMRC nukleáris anyagkutatási szemináriumának
következõ elõadására

                          Dr. Peter Fischer
        Max-Planck-Institut für Metallforschung, Stuttgart

  High resolution spatio-temporal imaging of micromagnetic structures
                         with polarised X-rays


Az elõadás helye: 1121 Budapest, Konkoly-Thege M. út 29-33.
                  KFKI RMKI 3. épület tanácsterem

Az elõadás idõpontja: 2003. szeptember 22., hétfõ, 14:00.

Az elõadáson minden érdeklõdõt szeretettel látunk.

                                                Nagy Dénes Lajos

Az elõadás kivonata:
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A fundamental understanding of magnetism on a nm length and sub-ns time
scale is currently focus of basic and applied solid state physics
research. The origin of interlayer exchange couling, perpendicular
magnetic anisotropies, unusual magneto resistance effects and dynamical
effects as precessional and damping/relaxation phenomena are only a few
examples. Low dimensional magnetic systems with lateral patterning are
also promising candidates in future magnetic storage and sensor
technologies, where both the miniaturisation and the speeding up of
switching processes are crucial.

The abundant availability of polarized X-rays at large scale synchrotron
facilities made studies feasible that are based on X-ray magnetic circular
dichroism as magnetic contrast mechanism. Magnetic absorption spectroscopy
studies provide insight in local spin and orbital moments. The combination
of XMCD with X-ray microscopies allows for an element-specific imaging of
magnetic domain structures with a lateral resolution at 20nm. Using the
pulsed time structure of synchrotrons stroboscopic pump-and-probe one is
in addition able now to image the magnetisation dynamics on a sub-ns time
scale.

I shall review the current status and the future perspectives of these new
technqiues that will contribute substantially to current issues in the
field of nanomagnetism.