Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 16: Micro- and Nanostructured Magnetic Materials II
MA 16.1: Vortrag
Mittwoch, 24. März 2010, 10:15–10:30, H23
Preparation and magnetic characterization of electrodeposited Fe and FePd nanowires — •Veronika Haehnel1,2, Heike Schlörb1, Sebastian Fähler1, and Ludwig Schultz1,2 — 1IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany — 2TU Dresden, Faculty of Mechanical Engineering, 01062 Dresden, Germany
Periodic arrays of high aspect ratio magnetic nanowires deposited in self-organised nanoporous templates have recently attracted much attention in fundamental and applied research. Scientific interest focuses on these low dimensional nanostructures, as significant changes in terms of chemical and physical properties compared to bulk material are expected. Fe nanowires are of particular interest due to their high magnetization promising high shape anisotropy. FePd alloys have unique magnetic and material properties. Around the composition Fe70Pd30 they are interesting candidates with regard to the magnetic shape memory effect (MSM). Preparing MSM-active nanowires, magnetically driven nanoactuators are conceivable.
In this study we show Fe nanowires electrodeposited into nanoporous alumina membranes. The electrodeposition process was optimized in order to approach an ideal behaviour of smooth and continuous Fe nanowires. Thereon saturation polarization and an anisotropy field up to 70% compared to pure Fe were measured. By Mössbauer spectroscopy and magnetic measurements we have found that shape anisotropy aligns the preferential magnetization axis along the long axis. Furthermore, we show the first results of structural and magnetic characterization of electrodeposited FePd nanowires.