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Related Concept Videos

ATP Driven Pumps II: P-type Pumps01:34

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The P-type pumps are a large family of integral membrane transporter ATPases. They are divided into five major types based on substrate specificity, from I to V.
A typical P-type pump has three cytosolic domains: nucleotide-binding (N), phosphorylation (P), and activator (A) domains. These domains are connected to the membrane-spanning helices by short amino acid segments. ATP hydrolysis and covalent phosphoenzyme intermediate formation are crucial parts of the catalytic cycle. At the highly...
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ATP Driven Pumps III: V-type Pumps01:30

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V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient.
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ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Spin Pumping Driven by Magnon Polarons.

Hiroki Hayashi1, Kazuya Ando1

  • 1Department of Applied Physics and Physico-Informatics, Keio University, Yokohama 223-8522, Japan.

Physical Review Letters
|December 22, 2018
PubMed
Summary
This summary is machine-generated.

Spin pumping, a phenomenon transferring spin angular momentum, is enhanced by magnon-phonon coupling at room temperature. This coupling, observed in magnetic insulators, boosts spin pumping efficiency through hybridized magnon-polaron modes.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Spin pumping is a crucial mechanism for generating spin currents in magnetic materials.
  • Magnon-phonon coupling offers a potential pathway to control spin dynamics.
  • Room temperature operation is essential for practical spintronic applications.

Purpose of the Study:

  • To investigate the resonant enhancement of spin pumping via magnon-phonon coupling.
  • To explore the role of hybridized magnon-phonon modes (magnon polarons) in spin pumping.
  • To demonstrate this phenomenon at room temperature.

Main Methods:

  • Utilizing microwave parametric excitation to drive dipole-exchange magnons.
  • Observing spin pumping enhancement near the intersection of magnon and phonon dispersions.
  • Employing a theoretical model based on magnon polaron dynamics.

Main Results:

  • A significant resonant enhancement of spin pumping was observed due to magnon-phonon coupling.
  • The enhancement surpasses that of purely magnonic spin pumping.
  • The results align with theoretical predictions for magnon polaron-mediated spin pumping.

Conclusions:

  • Magnon-phonon coupling provides an effective route to enhance spin pumping at room temperature.
  • Hybridized magnon-polaron modes are key to understanding this enhanced spin pumping.
  • This finding opens new avenues for efficient spin current generation in magnetic insulators.