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MM: Fachverband Metall- und Materialphysik

MM 41: Poster SYM Hydrogen in Materials: New Developments

MM 41.8: Poster

Donnerstag, 28. Februar 2008, 18:00–20:00, Poster B

Optimization of the magnetic properties of Co/Pd multilayers by applying a large persistent in-plane biaxial stress — •Senthilnathan Mohanan and Ulrich Herr — Insitut für Mikro- und Nanomaterialien, Universität Ulm, 89081 Ulm

Co/Pd multilayers exhibiting perpendicular magnetic anisotropy (PMA) are promising candidates for perpendicular recording media. In these multilayers, stress induced magnetic anisotropy contributes significantly to the PMA due to the high negative magnetostriction constant. We present a study about the optimization of the magnetic properties of Co/Pd multilayers by changing the magnetoelastic contribution to the anisotropy energy [1]. An in-plane biaxial tensile stress was applied to the Co/Pd multilayers by loading the Ta substrate with hydrogen. In-situ x-ray analysis during hydrogen loading and unloading showed that the hydrogen can absorb and desorb from the Co/Pd multiplayer under the conditions used, but that it remains in the Ta substrate after exposing the sample to air again. This leads to a persistent in-plane biaxial stress of up to 2.8 GPa in the Co/Pd mulilayers. We observed an increase of Hc and the remanent magnetization with increasing biaxial stress. Analysis of the effective perpendicular anisotropy Keff in terms of a simple model yields the corresponding magnetostriction constants. The authors gratefully acknowledge financial support by the Landesstiftung Baden-Württemberg, Germany.

1. S. Mohanan, and U. Herr, J. Appl. Phys. 102, 93903 (2007)