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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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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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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Spin-selective response tunability in two-dimensional nanomagnet.

S Rani1, A K Nair1, M Venkata Kamalakar2

  • 1Department of Physics, Indian Institute of Technology Patna, Bihta 801106, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 23, 2020
PubMed
Summary
This summary is machine-generated.

Strain engineering of the 2D material CrOCl induces tunable electronic and magnetic phase transitions. This versatile material exhibits 100% spin polarization, paving the way for advanced nanospintronic devices.

Keywords:
nanomagnetspintronicstwo-dimensional material

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Two-dimensional (2D) materials offer unique electronic and magnetic properties.
  • Chromium oxychloride (CrOCl) exhibits magnetic ordering with a Curie temperature of ~160 K.
  • Understanding strain effects is crucial for tailoring 2D material functionalities.

Purpose of the Study:

  • Investigate the impact of uniaxial and biaxial strain on CrOCl's electronic and transport properties.
  • Explore strain-induced phase transitions and their effect on spin polarization.
  • Assess the potential of CrOCl for nanospintronic applications.

Main Methods:

  • First-principles calculations were employed to study CrOCl.
  • Analysis of electronic band structure and density of states under strain.
  • Simulation of current-voltage (I-V) characteristics and spin-resolved conductance.

Main Results:

  • CrOCl monolayer demonstrates high mechanical flexibility with significant Young's modulus.
  • Strain induces phase transitions: bipolar magnetic semiconductor → half metal → magnetic metal.
  • Achieved 100% spin filtering and polarization under tensile strain.
  • Observed conductance fluctuations and high strain-assisted tunability in I-V response.

Conclusions:

  • CrOCl is a mechanically flexible 2D material with tunable electronic and magnetic properties.
  • Strain engineering enables multi-phase capabilities and 100% spin polarization.
  • CrOCl shows great promise for future nanospintronic device applications.