SKM 2021 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster Session III

CPP 8.25: Poster

Wednesday, September 29, 2021, 17:30–19:30, P

Spray-deposited anisotropic ferromagnetic hybrid polymer films of PS-b-PMMA and strontium hexaferrite magnetic nanoplatelets — •Wei Cao¹, Shanshan Yin¹, Andrei Chumakov², Matthias Opel³, Markus Gallei⁴, Matthias Schwartzkopf², Stephan V. Roth^2,5, and Peter Müller-Buschbaum^1,6 — ¹TU München, Physik-Department, 85748 Garching — ²DESY, 22607 Hamburg — ³WMI, Bayerische Akademie der Wissenschaften, 85748 Garching — ⁴Saarland University, Chair in Polymer Chemistry, 66123 Saarbrücken — ⁵KTH Royal Institute of Technology, Department of Fibre and Polymer Technology, 44 Stockholm, Sweden — ⁶TU München, MLZ, 85748 Garching

Spray deposition is applied to fabricate anisotropic ferromagnetic hybrid polymer films by controlling the orientation of strontium hexaferrite nanoplatelets inside ultrahigh molecular weight diblock copolymer (DBC) polystyrene-block-poly(methyl methacrylate) films. During spray deposition, the kinetics of structure evolution of the hybrid film is monitored in situ with grazing-incidence small-angle X-ray scattering. The obtained final hybrid film is then solvent annealed inside a closed chamber with tetrahydrofuran to study the influence of solvent vapor annealing (SVA). Due to the rearrangement of the nanoplatelets inside the DBC during SVA, an obvious change in the magnetic behavior of the hybrid film is observed. The hybrid film shows a perpendicular ferromagnetic anisotropy before SVA, which is strongly weakened after SVA. The spray deposited hybrid film appears highly promising for potential applications in magnetic data storage and sensors.