Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 22: Thin Films: Magnetic Coupling Phenomena / Exchange Bias / Magnetic Anisotropy
MA 22.7: Vortrag
Mittwoch, 7. September 2022, 11:00–11:15, H47
Evidence for perpendicular anisotropy gradients in Co thin films on Pt seeds — •Gauravkumar Patel1, Sven Stienen1, Ruslan Salikhov1, Rodolfo Gallardo2, Lorenzo Fallarino1,3, Kilian Lenz1, Jürgen Lindner1, and Olav Hellwig1,4 — 1Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden — 2Universidad Tecnica Federico Santa Maria, Valparíso, Chile — 3CIC energiGUNE BRTA, 01510 Vitoria-Gasteiz, Spain — 4Chemnitz University of Technology, 09107 Chemnitz
Tailoring the magnetization dynamics and anisotropy in ferromagnetic thin films by different seed layers is of great fundamental and practical importance, e.g., different seed layer materials lead to different microstructure and magnetocrystalline anisotropy energy. We have used Ta and Pt as seed layers for thin Co films and studied their broadband ferromagnetic resonance (FMR) in out-of-plane saturation as a function of Co thickness and determined the respective perpendicular magnetic anisotropy. For Ta seeds, the magnetic anisotropy decreases and shows an inverse thickness dependence. In contrast for Pt seeds the magnetic anisotropy is no longer monotonous with thickness, but shows an initial thickness dependent decrease with a distinct minimum and subsequently a steady increase again. XRD measurements show that for Pt seeds, the Co develops a well-defined hcp texture with a thickness dependent strain relaxation. As a result of this structural evolution for Co on Pt seeds our FMR measurements reveal a strong anisotropy gradient in growth direction for this system.