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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.4K
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...
2.4K
Valence Bond Theory02:42

Valence Bond Theory

9.1K
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...
9.1K
Colors and Magnetism03:02

Colors and Magnetism

12.3K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.3K
Structural Isomerism02:34

Structural Isomerism

19.6K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
19.6K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

17.4K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
17.4K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

27.3K
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...
27.3K

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Interface-Driven Multiferroicity in Cubic BaTiO3-SrTiO3 Nanocomposites.

Sagar E Shirsath1, M Hussein N Assadi2, Ji Zhang1

  • 1School of Materials Science and Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia.

ACS Nano
|September 7, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed low-cost, bulk perovskite nanocomposites exhibiting room-temperature multiferroicity. This breakthrough, driven by interface engineering, enables robust magnetoelectric coupling for advanced electronic devices.

Keywords:
ferroelectricityferromagnetismfirst-principles calculationsinterface engineeringmagnetoelectric couplingoxide perovskite

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Perovskite multiferroics are crucial for next-generation electronics but often require low temperatures.
  • Existing room-temperature multiferroics typically rely on complex thin-film interfaces with stringent fabrication requirements.
  • Cost-effective, large-scale applications are hindered by the limitations of current multiferroic materials and fabrication methods.

Purpose of the Study:

  • To investigate interface-driven multiferroicity in bulk polycrystalline materials.
  • To develop a cost-effective and scalable method for creating room-temperature multiferroics.
  • To explore the potential of BaTiO3-SrTiO3 nanocomposites for advanced electronic applications.

Main Methods:

  • Fabrication of cubic BaTiO3-SrTiO3 nanocomposites via a solid-state reaction route.
  • Interface engineering by controlling processing conditions.
  • Experimental and theoretical confirmation of multiferroic properties and magnetoelectric coupling.

Main Results:

  • Achieved interface-driven multiferroicity in low-cost, bulk polycrystalline BaTiO3-SrTiO3 nanocomposites.
  • Demonstrated coexistence of room-temperature ferromagnetism and ferroelectricity.
  • Confirmed robust magnetoelectric coupling, controllable via interface reconstruction.

Conclusions:

  • Bulk perovskite oxides offer a viable platform for achieving room-temperature multiferroicity.
  • Interface engineering in these nanocomposites unlocks significant potential for multifunctional electronic devices.
  • This approach overcomes the limitations of thin films, enabling applications like large-volume memory and magneto-optic modulators.