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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
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Magnetoelectric coupling in multiferroics probed by optical second harmonic generation.

Shuai Xu1,2, Jiesu Wang3, Pan Chen1

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China.

Nature Communications
|April 20, 2023
PubMed
Summary
This summary is machine-generated.

We explored magnetoelectric coupling in freestanding bismuth ferrite (BiFeO3) films using optical second harmonic generation. Strain release suppressed coupling, but freestanding films showed robustness against thermal fluctuations.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Magnetoelectric coupling offers device functionality and energy efficiency.
  • Probing magnetoelectric coupling in freestanding membranes and 2D materials is challenging due to instability.
  • Bismuth ferrite (BiFeO3) is a multiferroic material with potential for magnetoelectric applications.

Purpose of the Study:

  • To investigate magnetoelectric coupling in freestanding BiFeO3 films.
  • To demonstrate the manipulation of ferroelectric and antiferromagnetic orders using magnetic and thermal fields.
  • To define and measure an optical magnetoelectric-coupling constant.

Main Methods:

  • Epitaxial growth of BiFeO3 films on substrates and preparation of freestanding films.
  • Optical second harmonic generation to probe magnetoelectric coupling under an external magnetic field.
  • Application of magnetic and thermal fields to manipulate ferroelectric and antiferromagnetic orders.

Main Results:

  • Magnetoelectric coupling was successfully probed in both substrate-supported and freestanding BiFeO3 films.
  • An optical magnetoelectric-coupling constant was defined and measured.
  • Strain release was found to suppress magnetoelectric coupling.
  • Freestanding BiFeO3 films exhibited robust magnetoelectric coupling against thermal fluctuations.

Conclusions:

  • Freestanding BiFeO3 films offer a viable platform for studying and utilizing magnetoelectric coupling.
  • The defined optical magnetoelectric-coupling constant provides a new metric for material characterization.
  • Understanding the influence of strain and thermal stability is crucial for device applications.