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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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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 consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
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Color in Coordination Complexes
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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along 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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Optical Phenomena in Molecule-Based Magnetic Materials.

Jakub J Zakrzewski1,2, Michal Liberka1,2, Junhao Wang3

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Molecular magnetism integrates optical phenomena for advanced applications. This review explores optical effects in molecule-based magnets, enabling new functionalities in devices.

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Area of Science:

  • Molecular magnetism and its intersection with optical phenomena.

Background:

  • Development of molecular magnetism focuses on ferro-/ferrimagnets, spin transition materials, and single-molecule magnets (SMMs).
  • These materials offer potential applications in sensors, data storage, spintronics, and quantum computation.

Purpose of the Study:

  • To review the scope of optical phenomena in molecule-based magnetic materials.
  • Highlight recent advances and the interplay between optical effects and magnetism.

Main Methods:

  • Review of existing literature on molecule-based magnetic materials and their optical properties.
  • Discussion of specific phenomena like thermochromism, photoswitching, luminescence, and chiroptical effects.

Main Results:

  • Various optical phenomena can be integrated into molecule-based magnetic materials.
  • Interactions between optical effects and magnetism lead to multifunctionality.
  • Advances include high-temperature photomagnetism, optical thermometry with SMMs, and opto-magneto-electric effects.

Conclusions:

  • Optical phenomena significantly expand the application potential of molecule-based magnetic materials.
  • Multifunctionality arises from the synergy between optical and magnetic properties.
  • Future research directions include optical addressability of molecular qubits and magneto-chiral dichroism.