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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

8.6K
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...
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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

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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...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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1.0K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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Antiferromagnetic interlayer exchange coupled Co68B32/Ir/Pt multilayers.

Emily Darwin1,2, Riccardo Tomasello2, Philippa M Shepley1

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Scientific Reports
|January 3, 2024
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Summary
This summary is machine-generated.

Synthetic antiferromagnets offer high velocity and imaging benefits. Researchers engineered two systems, finding one suppressed the skyrmion Hall angle and achieved five times higher skyrmion velocity for advanced memory devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Synthetic antiferromagnetic (SAF) structures combine the high-speed dynamics of antiferromagnets with the experimental accessibility of ferromagnets.
  • SAF materials are promising for next-generation data storage, logic devices, and skyrmion racetrack memories.

Purpose of the Study:

  • To explore the potential and limitations of SAFs for device applications.
  • To engineer and investigate two distinct SAF systems to understand their properties for data storage and memory technologies.

Main Methods:

  • Fabrication and characterization of two SAF systems: (1) CoB/Ir/Pt multilayers with antiferromagnetic coupling and (2) coupled ferromagnetic multilayers with antiferromagnetic interactions.
  • Hysteresis measurements to analyze magnetic coupling stability.
  • Kerr imaging to observe switching behavior.
  • Temperature-dependent studies.
  • Micromagnetic simulations to predict skyrmion dynamics.

Main Results:

  • System 1 (CoB/Ir/Pt N repetitions) demonstrated stable antiferromagnetic interlayer exchange coupling up to N=7.
  • System 2 (coupled CoB/Ir/Pt multilayers) exhibited separate maze-like magnetic domain switching.
  • Both systems showed distinct temperature-dependent behaviors.
  • Micromagnetic simulations indicated suppressed skyrmion Hall angle and fivefold higher skyrmion velocity in System 1 compared to System 2.

Conclusions:

  • The engineered SAF systems exhibit unique magnetic properties and dynamics.
  • System 1 shows superior performance in terms of skyrmion velocity, suggesting its potential for high-speed memory applications.
  • Further research into SAF properties is crucial for optimizing their use in advanced electronic devices.