Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 5: Heusler compounds, semimetals and oxides (joint session MA/TT)
MA 5.3: Vortrag
Montag, 12. März 2018, 10:00–10:15, EB 301
Evolution of the interfacial perpendicular magnetic anisotropy constant of the Co2FeAl interface upon annealing — •Andres Conca1, Alessia Niesen2, Guenter Reiss2, and Burkard Hillebrands1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — 2Center for Spintronic Materials and Devices, Physics Department, Bielefeld University, 33615 Bielefeld, Germany
We investigate a series of films with different thicknesses of the Heusler alloy Co2FeAl in order to study the effect of annealing on the interface with a MgO layer and on the bulk magnetic properties. Our results reveal that while the perpendicular interface anisotropy constant KS⊥ is zero for the as-deposited samples, its value increases with annealing up to a value of 1.14 ± 0.07 mJ/m2 for the series annealed at 320oC and of 2.0 ± 0.7 mJ/m2 for the 450oC annealed series owing to a strong modification of the interface during the thermal treatment. This large value ensures a stabilization of a perpendicular magnetization orientation for a thickness below 1.7 nm. The data additionally shows that the in-plane biaxial anisotropy constant has a different evolution with thickness in as-deposited and annealed systems. The Gilbert damping parameter α shows an absolute minimum value of 2.8±0.1×10−3. The thickness dependence is explained in terms of an inhomogeneous magnetization state generated by the interplay between the different anisotropies of the system and by the crystalline disorder.
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