Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

MA: Magnetismus

MA 28: Spindynamik / Ummagnetisierungsvorg
änge

MA 28.10: Vortrag

Donnerstag, 11. März 2004, 17:30–17:45, H23

Dependence of magnetization reversal dynamics on magnetic anisotropy and interlayer coupling — •K. Fukumoto¹, W. Kuch¹, J. Vogel², J. Camarero³, S. Pizzini², Y. Pennec², F. Offi¹, M. Bonfim⁴, A. Fontaine², and J. Kirschner¹ — ¹Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany — ²Laboratoire Louis Néel, CNRS, 25 Avenue des Martyrs, B. P. 166, F-38042 Grenoble Cedex 9, France — ³Dpto. Física de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain — ⁴Departamento de Engenharia Elètrica, Universidade do Paraná, CEP 81531-990, Curitiba, Brazil

Time- and element-resolved magnetic domain imaging measurements were performed using x-ray magnetic circular dichroism photoelectron emission microscopy (XMCD-PEEM). Two types of spin-valve-like samples (Fe₂₀Ni₈₀/Cu/Co) were used in this study, one with and one without magnetic anisotropy in the film plane. Magnetization reversal during nanosecond-short magnetic field pulses was investigated by a pump-probe technique. Domain wall motion induced by the field pulses (pump) was imaged using photon pulses from single bunch operation of BESSY (probe). Magnetization reversal and domain structure of the permalloy layer in the sample showing no anisotropy in the plane are strongly influenced by local pinning. In the sample with in-plane anisotropy, domain patterns during the reversal of the permalloy layer are less reproducible, and more influenced by the local coupling with the Co layer. Reversal mechanism, speed of domain wall motion, and the effect of magnetic interlayer coupling were also studied using single-pulse measurements.