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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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Valence Bond Theory02:42

Valence Bond Theory

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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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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...
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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.
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Atomic Nuclei: Nuclear Spin State Overview01:03

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

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Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
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Room-Temperature Spin Transport in Cd3As2.

Gregory M Stephen1, Aubrey T Hanbicki1, Timo Schumann2

  • 1Laboratory for Physical Sciences, 8050 Greenmead Drive, College Park, Maryland 20740, United States.

ACS Nano
|March 11, 2021
PubMed
Summary
This summary is machine-generated.

Cd3As2 films exhibit robust spin transport at room temperature, paving the way for energy-efficient spintronic devices. This research demonstrates efficient charge-to-spin conversion and long spin-coherence lengths for advanced electronics.

Keywords:
Cd3As2nonlocal spin valvespin Hall effectspintronicstopological Dirac semimetal

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Increasing transistor density approaches atomic limits, causing energy loss and reduced efficiency.
  • Spintronic devices utilize electron spin for potentially higher performance and energy efficiency.
  • Novel materials are crucial for efficiently harnessing electron spin in spintronics.

Purpose of the Study:

  • To investigate spin transport properties of Cd3As2 films.
  • To demonstrate the potential of Cd3As2 for spintronic applications.
  • To explore charge-to-spin conversion efficiency and spin coherence in Cd3As2.

Main Methods:

  • Fabrication of Cd3As2 films.
  • Nonlocal spin valve measurements.
  • Inverse spin Hall effect measurements.

Main Results:

  • Robust spin transport observed in Cd3As2 films up to room temperature.
  • Demonstrated a nonlocal spin valve switch using Cd3As2.
  • Achieved high spin Hall angles (up to 1.5) and significant spin diffusion lengths (10-40 μm).

Conclusions:

  • Cd3As2 exhibits long spin-coherence lengths and efficient charge-to-spin conversion at room temperature.
  • Coherent spin transport in Cd3As2 is demonstrated, crucial for spintronic device realization.
  • Cd3As2 is a promising material for developing next-generation energy-efficient spintronic devices.