Spray-Deposited Anisotropic Ferromagnetic Hybrid Polymer Films of PS- b-PMMA and Strontium Hexaferrite Magnetic Nanoplatelets

Wei Cao, Shanshan Yin, Martina Plank, Andrei Chumakov, Matthias Opel, Wei Chen, Lucas P. Kreuzer, Julian E. Heger, Markus Gallei, Calvin J. Brett, Matthias Schwartzkopf, Artem A. Eliseev, Evgeny O. Anokhin, Lev A. Trusov, Stephan V. Roth, Peter Müller-Buschbaum

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Spray deposition is a scalable and cost-effective technique for the fabrication of magnetic hybrid films containing diblock copolymers (DBCs) and magnetic nanoparticles. However, it is challenging to obtain spray-deposited anisotropic magnetic hybrid films without using external magnetic fields. In the present work, spray deposition is applied to prepare perpendicular anisotropic magnetic hybrid films by controlling the orientation of strontium hexaferrite nanoplatelets inside ultra-high-molecular-weight DBC polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) films. During spray deposition, the evolution of DBC morphology and the orientation of magnetic nanoplatelets are monitored with in situ grazing-incidence small-angle X-ray scattering (GISAXS). For reference, a pure DBC film without nanoplatelets is deposited with the same conditions. Solvent-controlled magnetic properties of the hybrid film are proven with solvent vapor annealing (SVA) applied to the final deposited magnetic films. Obvious changes in the DBC morphology and nanoplatelet localization are observed during SVA. The superconducting quantum interference device data show that ferromagnetic hybrid polymer films with high coercivity can be achieved via spray deposition. The hybrid films show a perpendicular magnetic anisotropy before SVA, which is strongly weakened after SVA. The spray-deposited hybrid films appear highly promising for potential applications in magnetic data storage and sensors.

Original languageEnglish
Pages (from-to)1592-1602
Number of pages11
JournalACS Applied Materials and Interfaces
Volume13
Issue number1
DOIs
StatePublished - 13 Jan 2021

Keywords

  • ferromagnetic anisotropy
  • in situ GISAXS
  • magnetic nanoplatelets
  • spray deposition
  • ultra-high-molecular-weight diblock copolymer

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