Dresden 2009 – scientific programme

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MA: Fachverband Magnetismus

MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)

MA 40.36: Poster

Friday, March 27, 2009, 11:00–14:00, P1A

Magnetic nanowires and tubes with modulated diameter from a porous alumina template — •Kristina Pitzschel¹, Josep M. Montero Moreno^1,2, Ole Albrecht¹, Julien Bachmann¹, and Kornelius Nielsch¹ — ¹Institute of Applied Physics and Microstructure Research Center Hamburg, University of Hamburg — ²Electrodep, Dept. Physical Chemistry, Universitat de Barcelona

We utilize porous alumina membranes as templates in which mild and hard anodizations are combined to yield modulations in the pore diameter [1]. Filling the pores with Ni by electrodeposition delivers wires replicating the changes in diameter. Alternatively, atomic layer deposition allows for the preparation of Fe₃O₄ tubes with the same silhouettes [2]. Both types of structures are ferromagnetic. Ensemble magnetic measurements evidence a strong correlation between geometric parameters and magnetic properties. [1] W. Lee et al., Nature Nanotech. 3, 234 - 239 (2008). [2] J. Bachmann et al., J. Am. Chem. Soc. 129, 9554-9555 (2007). This research was financially supported by the SFB668.