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Berlin 2005 – scientific programme

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MA: Magnetismus

MA 24: Oberfl
ächenmagnetismus

MA 24.4: Talk

Tuesday, March 8, 2005, 11:15–11:30, TU A060

Tunable Magnetic Properties of Nanocrystalline Pd-Ni Alloy — •Sadhan Ghosh1, Christian Lemier1, Jörg Weissmüller1,2, and Viswanath Raghavan Nadar11Forschungszentrum Karlsruhe, Institut für Nanotechnologie, Karlsruhe — 2Fachrichtung Technische Physik, Universität des Saarlandes, 66041 Saarbrücken

Ferromagnetism is strongly related to the electronic structure density, 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 reversibly by inducing space−charge regions at 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 materials behaviour [1]. It has been demonstrated that the polarized nanoporous metals exhibit large volumetric expansion and contraction in phase with the applied electrode potential [2]. In the present work, we report the variation of the magnetic moment of charged nanocrystalline Pd−Ni alloy, produced by the inert−gas condensation method, by in−situ magnetization experiments. We discuss the relative variation of charge−induced magnetization by changing the alloy composition as well as changing the electrochemical environment. [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.

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