Regensburg 2004 – scientific programme

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MA: Magnetismus

MA 30: Magnetische dünne Schichten III

MA 30.5: Talk

Friday, March 12, 2004, 11:45–12:00, H10

Phase formation, microstructure and hard magnetic properties of electrodeposited FePt films — •Karin Leistner, Elke Backen, Barbara Schüpp, Martin Weisheit, Ludwig Schultz, Heike Schlörb, and Sebastian Fähler — IFW Dresden, Helmoltzstr. 20, 01069 Dresden

FePt is interesting for use in microelectromechanical systems and magnetic recording due to its high magnetocrystalline anisotropy. Studies up to now concentrate on films deposited by physical vapour deposition. However, electrodeposition would be a more effective way to produce films for such applications. FePt films of different compositions have been electrodeposited on Cu coated Si substrates. After deposition, films were annealed at temperatures of 400 - 900^∘C for 10 min in vacuum or hydrogen atmosphere. Phase formation, microstructure and magnetic properties are analysed. From these measurements, relationships between microstructural features and magnetic properties are discussed and necessary conditions to obtain good hard magnetic films are concluded. Magnetisation values and coercivities strongly improve when annealing takes place in the hydrogen atmosphere rather than in vacuum. Coercivity reaches a maximum value of 1.1 T after annealing at 600^∘C, which is higher than any value reported in literature for electrodeposited FePt films.