Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 28: Thin Films: Magnetic Anisotropy
MA 28.7: Vortrag
Mittwoch, 20. März 2024, 16:30–16:45, EB 107
Disclosing the hidden properties of thin cobalt films with mixed hcp and fcc phases — •G. Patel1,2, F. Ganss1, R. Salikhov1, S. Stienen1, L. Fallarino3, R. Ehrler4, R. Gallardo5, O. Hellwig1,4, K. Lenz1, and J. Lindner1 — 1Helmholtz-Zentrum Dresden-Rossendorf, Germany — 2Dresden University of Technology, Germany — 3CIC energiGUNE, Spain — 4Chemnitz University of Technology, Germany — 5Universidad Tecnica Federico Santa Maria, Chile
Cobalt is a magnetic material that finds extensive use in various applications, ranging from magnetic storage to ultrafast spintronics. Usually, it exists in two phases with hexagonal close-packed (hcp) or face-centered cubic (fcc) crystal structure. The crystal structure of Co films significantly influences their magnetic and spintronic properties. The ratio of the two Co phases has a significant influence on their magnetic properties, indicating that a seemingly simple material can be rather complex in real samples. We report on the thickness dependence of the structural and magnetic properties of sputter-deposited Co on a Pt seed layer. It grows in an hcp lattice at low thicknesses, while for thicker films, it becomes a mixed hcp-fcc phase due to a stacking fault progression. The reciprocal space map technique confirms the presence of both phases. Moreover, the precise determination of the Landé g-factor provides valuable insights into the structural properties. This careful study reveals the fundamental physics, but also provides important insight for potential applications of thin Co films with perpendicular magnetic anisotropy.
Keywords: Ferromagnetic Resonance; Perpendicular Magnetic Anisotropy; Reciprocal Space Mapping