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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene π orbitals.
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Chirality in Nature02:30

Chirality in Nature

Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid. The...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...

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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Coupling of order parameters, chirality, and interfacial structures in multiferroic materials.

Sergio Conti1, Stefan Müller, Arkady Poliakovsky

  • 1Institut für Angewandte Mathematik, Universität Bonn, Bonn, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 24, 2011
PubMed
Summary

We reveal a new duality in multiferroic materials, showing how interfacial structures change with coupling strength. This uncovers unique behavior where secondary order parameters activate at interfaces.

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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

Published on: May 29, 2018

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Multiferroic Materials

Background:

  • Multiferroic materials exhibit complex behaviors due to coupled order parameters.
  • Understanding interfacial phenomena is crucial for device applications.
  • Biquadratic coupling introduces unique interactions between order parameters.

Purpose of the Study:

  • To investigate optimal interfacial structures in multiferroic materials with biquadratic coupling.
  • To explore the duality relation between strong and weak coupling regimes.
  • To analyze the phase diagram and the role of gradient term anisotropy.

Main Methods:

  • Theoretical analysis of multiferroic systems.
  • Investigation of biquadratic coupling effects.
  • Phase diagram analysis based on coupling constants and gradient anisotropy.

Main Results:

  • A novel duality relation was discovered between strong and weak coupling regimes for isotropic gradient terms.
  • The phase diagram was analyzed, revealing distinct regimes based on coupling and anisotropy.
  • A specific regime was identified where the secondary order parameter is activated exclusively at the interface.

Conclusions:

  • The study elucidates the complex interplay of coupling and anisotropy in multiferroic interfaces.
  • The discovered duality offers a new perspective on understanding these materials.
  • The interfacial activation of secondary order parameters highlights potential for novel functionalities.