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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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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.
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In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
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Spin dynamics in a Curie-switch.

A F Kravets1, A I Tovstolytkin, Yu I Dzhezherya

  • 1Institute of Magnetism, National Academy of Sciences of Ukraine, 36 b Vernadsky Blvd., 03142 Kyiv, Ukraine. Nanostructure Physics, Royal Institute of Technology, 10691 Stockholm, Sweden.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|October 17, 2015
PubMed
Summary
This summary is machine-generated.

Investigating ferromagnetic resonance in F1/f/F2/AF multilayers reveals spacer properties significantly influence resonance fields. Key magnetic parameters like exchange length and Curie temperature are crucial for understanding spin dynamics in these nanostructures.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Ferromagnetic resonance (FMR) is a key technique for probing magnetic properties of materials.
  • Multilayer structures with ferromagnetic and antiferromagnetic layers offer tunable magnetic behaviors.
  • Understanding interfacial effects and spacer properties is crucial for advanced magnetic devices.

Purpose of the Study:

  • To investigate the ferromagnetic resonance properties of F1/f/F2/AF multilayers.
  • To determine the influence of the ferromagnetic spacer layer on resonance fields.
  • To identify key magnetic parameters governing FMR in these structures.

Main Methods:

  • Experimental investigation of F1/f/F2/AF multilayers using ferromagnetic resonance.
  • Theoretical calculations to model spacer-mediated exchange coupling effects.
  • Deduction of magnetic parameters from experimental data for Ni(x)Cu(100-x) spacers.

Main Results:

  • Spacer-mediated exchange coupling strongly affects resonance fields of both soft (F1) and hard (F2) ferromagnetic layers.
  • Key spacer parameters identified: magnetic exchange length (Λ), effective saturation magnetization (m0), and effective Curie temperature (T(C)(eff)).
  • Parameter values determined for Ni(x)Cu(100-x) spacers (x = 54–70 at. %, d = 3–6 nm).

Conclusions:

  • The study provides insights into thermally-controlled spin precession and switching in magnetic nanostructures.
  • Identified parameters are critical for designing and optimizing spin-based oscillators and memory devices.
  • Spacer properties play a pivotal role in determining FMR behavior in complex magnetic multilayers.