Dresden 2003 – wissenschaftliches Programm
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MA: Magnetismus
MA 18: Spindynamik / Ummagnetisierungsvorg
änge
MA 18.4: Vortrag
Mittwoch, 26. März 2003, 16:00–16:15, HSZ/401
Time-resolved study of magnetic domain reversal using photoelectron emission microscopy — •K. Fukumoto1, W. Kuch1, M. Bonfim2, J. Vogel3, J. Camarero3, F. Offi1, Y. Pennec3, A. Fontaine3, S. Pizzini3, and J. Kirschner1 — 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany — 2Departamento de Engenharia Elètrica, Universidade do Paraná, CEP 81531-990, Curitiba, Brazil — 3Laboratoire Louis Néel, CNRS, B. P. 166, F-38042 Grenoble, France
The magnetization reversal dynamics of the permalloy layer in a Fe19Ni81/Cu/Co spin valve was observed in the ns range using photoelectron emission microscopy (PEEM) and X-ray magnetic circular dichroism to obtain time-resolved magnetic domain images. The measurements were performed in a stroboscopic pump-probe mode. Magnetic pulses as high as 300 Oe were applied by a micro-coil mounted on the sample holder (pump), and the photon pulses from single bunch operation of BESSY II were used to obtain magnetic domain images at the Fe L3 absorption edge (probe). Reproducible magnetic domain wall motion and nucleation were observed by scanning the delay time between the magnetic field pulse and the photon bunch in steps of a few ns. The balance between domain nucleation and domain wall propagation was found to depend on the field strength and the duration of the magnetic pulse, but also differs on both sides of the minor loop of the permalloy layer.