Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)
MA 63.41: Poster
Freitag, 18. März 2011, 11:00–14:00, P2
High quality electrodeposited Fe100−xGax films for magnetostrictive applications — •Diana Iselt1,2, Heike Schlörb1, Sebastian Fähler1, and Ludwig Schultz1,2 — 1IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, 01171 Dresden, Germany — 2TU Dresden, Faculty of Mechanical Engineering, 01062 Dresden
Magnetostrictive materials can be used to build electromagnetic sensing and actuating devices. A promising candidate to overcome the mechanical limitations of Terfenol-D is Fe100−xGax with 15 to 25 at.% Ga, which exhibits high mechanical strength and low saturation fields. For sensor application an efficient, scalable preparation way is required for thin film and nanowire fabrication. In this study FeGa alloy films with a desired composition close to Fe80Ga20 have been fabricated electrochemically on Pt substrates. For a conventional deposition at constant potentials strong interactions of the electrolyte with the platinum coated substrate are identified to cause low reproducibility and high oxygen content. The use of optimised pre-treatment and pulsed potential conditions resulted in dense and homogeneous films with a (110) α−Fe3Ga fibre texture. Oxygen content was reduced below 1 at.% and the saturation magnetization reaches up to 1.7 T, confirming the high quality of these films. In order to understand the influence of the substrate on morphology and oxygen content deposition on gold and copper coated substrates have been carried out.