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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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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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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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Phase-locking in double-point-contact spin-transfer devices.

F B Mancoff1, N D Rizzo, B N Engel

  • 1Technology Solutions Organization, Freescale Semiconductor Inc., Chandler, Arizona 85224, USA. fred.mancoff@freescale.com

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Summary
This summary is machine-generated.

Spin-transfer torque enables phase-locking of magnetization oscillations in closely spaced magnetic point contacts. This synchronization enhances output power, paving the way for advanced microwave oscillators and memory devices.

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Spin-transfer torque arises from the interaction between spin-polarized currents and magnetic materials.
  • Previous experiments demonstrated magnetization reversal or precession in magnetic devices at high current densities.
  • Spin-transfer devices hold promise for magnetic random-access memory and microwave oscillators.

Purpose of the Study:

  • To investigate the phase-locking behavior of magnetization oscillations in coupled giant magnetoresistance (GMR) point contacts.
  • To determine the effect of contact spacing on the resonance frequency and output power of spin-transfer devices.

Main Methods:

  • Fabrication of two 80-nm-diameter GMR point contacts with varying spacings (less than 200 nm to >400 nm).
  • Measurement of magnetization oscillations induced by spin-transfer current.
  • Analysis of resonance frequencies and output power as a function of contact spacing.

Main Results:

  • Phase-locking of magnetization oscillations into a single resonance was observed for contact spacings below approximately 200 nm.
  • The phase-locked resonance frequency ranged from below 10 GHz to over 24 GHz.
  • Closely spaced contacts (phase-locked) exhibited approximately twice the output power compared to widely spaced contacts with separate resonances.

Conclusions:

  • Phase-locking of spin-transfer-induced magnetization oscillations in closely spaced GMR point contacts is achievable.
  • This phase-locking phenomenon leads to a significant increase in output power, suggesting potential for enhanced microwave oscillator applications.
  • The ability to control phase-locking in coupled spin-transfer devices could enable the development of large, synchronized arrays for advanced spintronic applications.