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Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Solution-Processed Multiferroic Thin-Films with Large Magnetoelectric Coupling at Room-Temperature.

Hamed Sharifi Dehsari1, Morteza Hassanpour Amiri1, Kamal Asadi1,2,3

  • 1Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.

ACS Nano
|April 17, 2023
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Summary
This summary is machine-generated.

Researchers developed multiferroic polymer nanocomposites (MPCs) thin films exhibiting a significant room-temperature magnetoelectric coupling coefficient without external magnetic fields. Uniform nanoparticle dispersion via surface functionalization is key to this achievement for advanced electronic devices.

Keywords:
ferroelectric polymermagnetic nanoparticlemagnetoelectric couplingmultiferroicnanocomposites

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Achieving significant room-temperature magnetoelectric coupling in thin films without external DC magnetic fields remains a challenge.
  • Multiferroic polymer nanocomposites (MPCs) offer potential for novel electronic applications.

Purpose of the Study:

  • To experimentally realize thin films with a large magnetoelectric coupling coefficient at room temperature, independent of external magnetic fields.
  • To investigate the role of nanoparticle dispersion on magnetoelectric properties in MPCs.

Main Methods:

  • Fabrication of multiferroic polymer nanocomposites (MPCs) thin films using PMMA-grafted cobalt-ferrite nanoparticles dispersed in a P(VDF-TrFE) matrix.
  • Surface functionalization of nanoparticles via atom transfer radical polymerization (ATRP) to ensure uniform dispersion.
  • Characterization of magnetoelectric coupling coefficient (αME) in the absence of external DC magnetic fields.

Main Results:

  • A large magnetoelectric coupling coefficient of 750 ± 30 mV Oe⁻¹ cm⁻¹ was achieved in MPCs thin films at room temperature without an external DC magnetic field.
  • Nanoparticle agglomeration was found to significantly reduce the magnetoelectric coupling coefficient.
  • Surface functionalization via PMMA grafting enabled uniform nanoparticle dispersion, maximizing interfacial interactions and leading to enhanced αME.

Conclusions:

  • Uniform dispersion of surface-functionalized nanoparticles is critical for achieving high magnetoelectric coupling in MPCs thin films.
  • Solution-processed MPCs thin films demonstrate potential for flexible and printable multiferroic electronic devices.
  • The findings pave the way for applications in sensing and memory technologies.