Dresden 2006 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MM: Metall- und Materialphysik
MM 38: Nanostructured Materials II
MM 38.1: Vortrag
Donnerstag, 30. März 2006, 16:30–16:45, IFW D
Charge induced reversible magnetization in nanocrystalline transition metal alloys — •Sadhan Ghosh1, Christian Lemier1, and Jörg Weissmüller1,2 — 1Forschungszentrum Karlsruhe, Institut für Nanotechnologie, Karlsruhe — 2Technische Physik, Universität des Saarlandes, Saarbrücken
Ferromagnetism is fundamentally related to the electronic density of states. Therefore, it is interesting to study how far one can modify the magnetic order of solids by changing their electron density. While this is usually done by alloying, one can also change the charge density by inducing space-charge regions at the metal surfaces. This is particularly interesting in nanostructured materials, since the high surface to volume ratio maximizes the effect of the local property changes on the macroscopic scale [1]. Here we intend to explore possibility of changing the magnetic properties of transition metal alloys by using the concept of Helmholtz double layer space charging at the metal-electrolyte interface. Since charging also leads to volumetric strain in the nanoporous materials [2] the effect of resulting pressure on magnetism [3] has also been considered.
[1] Gleiter H., Weissmüller J., Wollersheim O., Würschum R. Acta mater. 49 (2001), 737. [2] Weissmüller, J., Viswanath, R.N., Kramer, D., Zimmer, P., Würschum, R., Gleiter, H. Science 300 (2003), 312. [3] Lemier C., Ghosh S., Weissmüller J., Viswanath R. N., MRS Symp. Proc. 876E R2.6 (2005)