Dresden 2014 – scientific programme

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MA: Fachverband Magnetismus

MA 28: Magnetic Materials I

MA 28.4: Talk

Wednesday, April 2, 2014, 15:45–16:00, HSZ 04

Annealing influence on the Gilbert damping parameter and the exchange constant of CoFeB thin films — •Andres Conca, Evangelos Th. Papaioannou, Stefan Klingler, Jochen Greser, Thomas Sebastian, Britta Leven, and Burkard Hillebrands — FB Physik und Landesforschungszentrum OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany

The search for materials with low-damping properties is very active due to their importance for many fields such as spin-waves experiments, STNOs or for other purposes in magnon spintronics. In this sense, CoFeB is a very promising material with low damping constant values. It is known that an annealing step is required to induce a crystallization of the as-deposited amorphous CoFeB thin films.

A low damping value of α = 0.0042 and an exchange constant of A = 1.5× 10⁻¹¹ J/m for as-deposited Co₄₀Fe₄₀B₂₀ thin films have been recently reported by us [1]. Now, we report on the influence of the annealing temperature on these and other film properties.

The films were studied by measuring the ferromagnetic resonance using a strip-line vector network analyzer (VNA-FMR). The results are shown for 78 nm thick films annealed at 200-400^∘C during 30 min. The meaning of the results and the correlation with the crystallization process measured by x-ray diffraction is discussed.

Support by the state of Rhineland-Palatinate (MBWWK and MWKEL) and by the ERDF programm in the frame of the Spintronic Technology Platform (STeP) is gratefully acknowledged.

[1] J. Appl. Phys. 113, 213909 (2013).