Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 33: Poster II

MA 33.24: Poster

Freitag, 26. März 2010, 11:00–14:00, Poster B1

Synthesis and characterization of boron-doped magnetic thin films and nanowires — •Martin Waleczek, Robert Zierold, Julien Bachmann, and Kornelius Nielsch — Institut für Angewandte Physik, Jungiusstr. 11, D-20355 Hamburg

Boron-doped magnetic thin films and nanowires can be fabricated by means of iron-boron electrodeposition from an alcaline electrolyte [1], using electropolished copper as substrate for the films and self-ordered porous alumina as template for the wires.

Due to the high pH of the electroplating bath, the alumina template has to be protected by a thin silica layer via atomic layer deposition (ALD) [2]. The Fe/B ratio can be optimized by changing the electrolyte composition, as well as the electrodeposition parameters. Diameter (40-300 nm) and length (micrometer-range) of the wires can easily be adjusted by controlling the template synthesis and the deposition time, respectively.

Investigation of the magnetic behaviour of the FeB thin films and of the nanowire arrays is done by SQUID and MOKE measurements.

The magnetic properties as well as the high boron content enclosed in a biocompatible and functionizable silica shell show this system’s potential as a new approach to applications in boron neutron capture therapy (BNCT), where ¹⁰B near or in tumor cells converts to ⁷Li upon catching a thermal neutron and emits high energy particles, which have a very local, highly destructive effect on nearby tissue.

[1] Rakovich, E. V. et. al. : Russ. J. of Appl. Chem. 73 7 (2000)

[2] Bachmann, J. et. al. : Angew. Chem. Int. Ed. 47 33 (2008)