Solution-processed multiferroic thin-films with large magnetoelectric coupling at room-temperature

Hamed Sharifi Dehsari, Morteza Hassanpour Amiri, Kamal Asadi

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Experimental realization of thin films with a significant room-temperature magnetoelectric coupling coefficient, αME, in the absence of an external DC magnetic field, has been thus far elusive. Here, a large coupling coefficient of 750 ± 30 mV Oe-1 cm-1 is reported for multiferroic polymer nanocomposites (MPCs) thin-films in the absence of an external DC magnetic field. The MPCs are based on PMMA-grafted cobalt-ferrite nanoparticles uniformly dispersed in the piezoelectric polymer poly(vinylidene fluoride-co-trifluoroethylene, P(VDF-TrFE). It is shown that nanoparticle agglomeration plays a detrimental role and significantly reduces αME. Surface functionalization of the nanoparticles by grafting a layer of poly(methyl methacrylate) (PMMA) via atom transfer radical polymerization (ATRP) renders the nanoparticle miscible with P(VDF-TRFE) matrix, thus enabling their uniform dispersion in the matrix even in submicrometer thin films. Uniform dispersion yields maximized interfacial interactions between the ferromagnetic nanoparticles and the piezoelectric polymer matrix leading to the experimental demonstration of large αME values in solution-processed thin films, which can be exploited in flexible and printable multiferroic electronic devices for sensing and memory applications.

Original languageEnglish
Pages (from-to)8064–8073
Number of pages10
JournalACS Nano
Issue number9
Early online date17 Apr 2023
Publication statusPublished - 9 May 2023

Bibliographical note

Funding Information:
H.S.D., M.H.A., and K.A. acknowledge the Alexander von Humboldt Foundation (Germany) for financial support through Sofja Kovalevskaja Award. The Max Planck Institute for Polymer Research (Mainz, Germany) is acknowledged for supporting the work presented.


  • ferroelectric polymer
  • magnetic nanoparticle
  • magnetoelectric coupling
  • multiferroic
  • nanocomposites

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)


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