Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65

MA 20.10: Poster

Montag, 7. März 2005, 14:00–18:00, Poster TU C

On origin of perpendicular anisotropy in Co/Pd(111) system — •J. Zukrowski, M. Przybylski, M. Wasniowska, W. Wulfhekel, J. Barthel, and J. Kirschner — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle

Ultrathin Co films were grown on clean and atomically flat surfaces of Pd(111). Scanning tunneling microscopy (STM) measurements show that at room temperature (RT) the growth starts by a formation of double-layer patches. This is very different in comparison to the initial monolayer formation during the growth at 420 K. The films deposited at RT exhibit perpendicular magnetic anisotropy after exposure to a residual atmosphere for a long time at low temperatures (70 K). Our detailed magneto-optical Kerr effect (MOKE) analysis documents step by step an appearance of the perpendicular anisotropy and indicates a rotation of the magnetization vector from the sample plane. With increasing temperature the magnetization rotates back to the sample plane abruptly when the temperature approaches 200 K. For the growth at 420 K the STM images show that the film morphology is drastically changed. This is associated with changes of the magnetic properties detected by MOKE. In particular, the Kerr rotation loops measured in polar configuration change sign at a critical thickness of the Co film.