Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 46: Poster II
MA 46.25: Poster
Thursday, March 21, 2024, 15:00–18:00, Poster C
Sprayed nanometer-thick hard magnetic coatings with strong perpendicular anisotropy for data-storage applications — •A. Chumakov1, C.J. Brett1,2, K. Gordeyeva2, D. Menzel3, L.O.O. Akinsinde4,5, M. Gensch1, M. Schwartzkopf1, W. Cao6, S. Yin6, M.A. Reus6, M.A. Rübhausen4, P. Müller-Buschbaum6, L.D. Söderberg2, and S.V. Roth1,2 — 1DESY, Hamburg, Germany — 2KTH, Stockholm, Sweden — 3Technische Universität Braunschweig, Braunschweig, Germany — 4Universität Hamburg, Hamburg, Germany — 5Kiel University, Kiel, Germany — 6Technische Universität München, Garching, Germany
Ferromagnetic SrFe12O19 nanoparticles with a solid magnetic moment perpendicular to their plane and stabilized by a positive surface charge can form a self-ordered coating under the influence of magnetic fields drying from dispersion. We investigated the film formation of a stable colloid dispersion of ferromagnetic nanoplates and nanoblocks onto a silicon substrate and cellulose nanofilm without and under the action of an external magnetic field during scalable layer-by-layer spraying. The formation of a film of ferromagnetic particles from an aqueous colloid makes it possible to form a stable magnetic coating of agglomerates of nanoparticles with a fractal structure. An external magnetic field in the deposition process leads to the appearance of residual magnetization in the film. In this case, particles with a smaller aspect ratio (nanoblocks) form a periodic structure of agglomerates of nanoparticles with signs of an artificial opal-like structure.
Keywords: GISAXS; GIWAXS; nanoplateletes; magnetic nanoparticles; SQUISD